{"id":162,"date":"2026-09-15T17:02:37","date_gmt":"2026-09-15T17:02:37","guid":{"rendered":"https:\/\/bulkdevices.co.uk\/blog\/?p=162"},"modified":"2026-10-08T17:03:14","modified_gmt":"2026-10-08T17:03:14","slug":"workstation-shuts-down-under-heavy-load","status":"publish","type":"post","link":"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/","title":{"rendered":"Why Does a Workstation Shut Down Under Heavy Load?"},"content":{"rendered":"<p><b>Quick Answer:<\/b><\/p>\n<p><span style=\"font-weight: 400;\">If your workstation works normally when you&#8217;re doing light tasks but suddenly turns off when you start rendering, exporting, gaming, or running a demanding CAD job, the power supply (PSU) and cooling system are the first places to look. An <\/span><b>undersized power supply<\/b><span style=\"font-weight: 400;\">, overheating, ageing PSU capacitors, or <\/span><b>overcurrent protection (OCP)<\/b><span style=\"font-weight: 400;\"> can all cause this behaviour. The important part is finding the actual cause before replacing any hardware.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Here are a few things worth knowing:<\/span><\/p>\n<ul style=\"list-style: disc !important;\">\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A shutdown that happens only during heavy workloads usually points towards a power- or heat-related issue.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">A PSU that worked well with your original setup may struggle after a major hardware upgrade.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">OCP is a safety feature that protects the PSU rather than being a problem by itself.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">An older PSU can gradually lose its ability to provide clean, stable power.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Testing the workstation with a known-good PSU is one of the best ways to narrow down the problem.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">If you&#8217;ve recently installed a more powerful graphics card, added extra drives, or have been using the same workstation for several years, the following checks can help you find the reason behind the shutdown.<\/span><\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#The_Exact_Symptom_Pattern_Fine_at_Idle_Fails_Under_Load\" >The Exact Symptom Pattern: Fine at Idle, Fails Under Load<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#The_Most_Common_Cause_An_Undersized_Power_Supply\" >The Most Common Cause: An Undersized Power Supply<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#How_to_Tell_If_Your_PSU_Is_Genuinely_Underpowered\" >How to Tell If Your PSU Is Genuinely Underpowered<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#Choosing_the_Right_Wattage_for_a_Workstation\" >Choosing the Right Wattage for a Workstation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#Thermal_Shutdown_When_Heat_Not_Power_Is_the_Cause\" >Thermal Shutdown: When Heat, Not Power, Is the Cause<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#Aging_PSU_Capacitors_and_Power_Delivery_Degradation\" >Aging PSU Capacitors and Power Delivery Degradation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#Overcurrent_Protection_OCP_and_Why_It_Trips\" >Overcurrent Protection (OCP) and Why It Trips<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#How_to_Diagnose_the_Real_Cause_Step-by-Step\" >How to Diagnose the Real Cause (Step-by-Step)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#Symptom_Likely_Cause_Fix_Quick_Reference\" >Symptom, Likely Cause &amp; Fix Quick Reference<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#Common_Mistakes_When_Diagnosing_This\" >Common Mistakes When Diagnosing This<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/bulkdevices.co.uk\/blog\/workstation-shuts-down-under-heavy-load\/#FAQs\" >FAQs<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"The_Exact_Symptom_Pattern_Fine_at_Idle_Fails_Under_Load\"><\/span><b>The Exact Symptom Pattern: Fine at Idle, Fails Under Load<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">When a <\/span><b>computer shuts down under load<\/b><span style=\"font-weight: 400;\"> but works perfectly during normal use, the pattern itself gives you an important clue.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example, your workstation might sit on the desktop for hours, handle emails and documents without any issue, and then switch off a few minutes after you start a render. The same thing can happen during a demanding game, video export, simulation, or CAD task.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This is different from a computer that shuts down at completely random times. Random crashes can have many possible causes, including drivers, operating system problems, memory issues, or other hardware faults. When the shutdown happens specifically as the CPU or GPU starts working harder, power delivery and temperature become much more likely suspects.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The reason is simple: demanding workloads make your components consume more power and produce more heat. If the PSU cannot provide enough stable power, or the cooling system cannot remove the extra heat, the workstation may shut itself down.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"The_Most_Common_Cause_An_Undersized_Power_Supply\"><\/span><b>The Most Common Cause: An Undersized Power Supply<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">One of the most common reasons a workstation switches off during a demanding task is an insufficient power supply.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This often happens after a hardware upgrade. The original PSU may have been perfectly suitable for the computer when it left the factory. Once you add a more powerful graphics card, additional storage drives, or other hardware, however, the total power requirement changes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A <\/span><b>305W desktop PSU<\/b><span style=\"font-weight: 400;\"> is a good example. Supplies in this wattage class are commonly found in compact Dell OptiPlex-class systems. This wattage class is sometimes listed under part numbers such as L305P-03 and is suitable for the lower-power hardware these systems were originally designed around.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Problems can start when you put a much more demanding GPU or several additional drives into the same machine. The workstation may continue working normally during everyday tasks because those tasks don&#8217;t use much power. Once the CPU and GPU are pushed harder, the PSU may no longer have enough capacity to keep everything running.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you&#8217;re using<\/span><a href=\"https:\/\/bulkdevices.co.uk\/n305p-03-dell-305-watts-power-supply-for-optiplex-gx620\"> <span style=\"font-weight: 400;\">a 305W Dell OptiPlex power supply<\/span><\/a><span style=\"font-weight: 400;\"> or a similar unit in a machine that has been upgraded, checking the PSU should be one of your first steps.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Tell_If_Your_PSU_Is_Genuinely_Underpowered\"><\/span><b>How to Tell If Your PSU Is Genuinely Underpowered<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Start by looking at how much power your components actually need. A <\/span><b>power supply wattage calculator<\/b><span style=\"font-weight: 400;\"> can help you estimate the combined power requirements of your CPU, graphics card, storage drives, fans, and other hardware.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Don&#8217;t just compare the calculated figure with the number printed on the PSU and stop there. You also need some extra capacity between your normal system requirements and the PSU&#8217;s maximum continuous output.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Another thing to remember is that power consumption isn&#8217;t always perfectly steady. A graphics card can briefly draw more power when it boosts its clock speed. These short spikes can put extra pressure on a PSU that is already running close to its limit.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">For example, a system that appears to need around 450W during normal heavy use may still benefit from a PSU with considerably more capacity. Having some headroom gives the power supply room to deal with short increases in demand instead of constantly operating at its limit.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Choosing_the_Right_Wattage_for_a_Workstation\"><\/span><b>Choosing the Right Wattage for a Workstation<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">A workstation with a powerful GPU, multiple drives, and a high-performance processor needs more than just enough power to start and run. It needs a PSU with enough capacity to handle sustained workloads comfortably.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">An <\/span><b>875W workstation PSU<\/b><span style=\"font-weight: 400;\"> is one example of a higher-capacity option. This higher-capacity class is sometimes listed under part numbers such as N875EF-00. A supply in this range can provide considerably more room for a demanding graphics card, a multi-core CPU, several storage devices, and short power spikes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When looking at a <\/span><b>workstation PSU upgrade<\/b><span style=\"font-weight: 400;\">, efficiency is worth considering too. The 80 PLUS rating indicates how efficiently a PSU converts electricity into usable power. Higher ratings such as Bronze, Gold, and Platinum generally mean less energy is lost as heat during operation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you need a higher-capacity supply,<\/span><a href=\"https:\/\/bulkdevices.co.uk\/w299g-dell-875-watts-power-supply-for-precision-t5500-workstation-alienware-aurora\"> <span style=\"font-weight: 400;\">an 875W Dell Precision T5500 power supply<\/span><\/a><span style=\"font-weight: 400;\"> can be suitable for workstations designed to use this type of PSU.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Thermal_Shutdown_When_Heat_Not_Power_Is_the_Cause\"><\/span><b>Thermal Shutdown: When Heat, Not Power, Is the Cause<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Not every shutdown under load is caused by the PSU. Sometimes the workstation is simply getting too hot.<\/span><\/p>\n<p><b>Thermal shutdown vs. power shutdown<\/b><span style=\"font-weight: 400;\"> can be difficult to tell apart because the result looks almost identical. In both cases, the display can suddenly go black, and the computer can switch off.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">A thermal shutdown happens when a temperature sensor detects that a component has reached a level where continuing to operate could put the hardware at risk. The system then shuts down to protect itself.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Dust is one common reason for this. Dust can collect around fans, heatsinks, vents, and filters, making it harder for hot air to leave the case. Poor cable management or restricted airflow can also make the situation worse.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Old thermal paste can be another factor, particularly on a workstation that has been running for years. As the thermal paste becomes less effective, heat may not transfer away from the CPU as efficiently as it once did.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Before a full thermal shutdown, you may notice <\/span><b>thermal throttling<\/b><span style=\"font-weight: 400;\">. This happens when the CPU or GPU reduces its performance to bring temperatures back under control. If the temperature continues rising despite this, the system may eventually shut down.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Aging_PSU_Capacitors_and_Power_Delivery_Degradation\"><\/span><b>Aging PSU Capacitors and Power Delivery Degradation<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">An older PSU can also develop problems gradually. <\/span><b>Aging power supply symptoms<\/b><span style=\"font-weight: 400;\"> aren&#8217;t always obvious because the unit may continue working normally for a long time before the problem becomes noticeable.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Power supplies use capacitors to help smooth and stabilise their electrical output. Over time, heat and normal ageing can reduce their effectiveness.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">As capacitors deteriorate, <\/span><b>PSU ripple<\/b><span style=\"font-weight: 400;\"> can increase, and the PSU may have more difficulty providing clean, stable power when the system is under a heavy load.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In some cases, damaged capacitors may show visible signs such as bulging or leaking. However, you shouldn&#8217;t open a PSU just to inspect its components unless you&#8217;re qualified to work safely with power supplies.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">This can explain why a workstation that has been completely reliable for years may suddenly begin shutting down during demanding jobs. Nothing about the computer may have changed, but the PSU itself may no longer be performing as well as it once did.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Overcurrent_Protection_OCP_and_Why_It_Trips\"><\/span><b>Overcurrent Protection (OCP) and Why It Trips<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Overcurrent protection trip explained<\/b><span style=\"font-weight: 400;\"> simply: OCP is a safety feature built into modern power supplies. If the current reaches a level beyond what the PSU is designed to handle, the protection system can shut the unit down.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">That&#8217;s not necessarily a sign that the PSU is faulty. In fact, the PSU is doing what it was designed to do by protecting itself and the connected hardware.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Modern CPUs and GPUs draw much of their power through the 12V rail, so this is an area worth considering when repeated shutdowns happen during heavy workloads.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If OCP keeps triggering, there are a couple of possibilities. The PSU may not have enough capacity for the current hardware, or another component may be drawing more current than it should.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Overvoltage protection (OVP) is another safety feature found in power supplies. Instead of responding to excessive current, it responds to voltage conditions outside the expected range.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"How_to_Diagnose_the_Real_Cause_Step-by-Step\"><\/span><b>How to Diagnose the Real Cause (Step-by-Step)<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">Instead of replacing parts and hoping the problem disappears, work through the checks one at a time.<\/span><\/p>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Look at the shutdown pattern.<\/b><span style=\"font-weight: 400;\"> Does it happen during GPU-heavy work, CPU-heavy work, or both? Also note whether the system turns off immediately or after several minutes.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Check temperatures under load.<\/b><span style=\"font-weight: 400;\"> Use a monitoring tool such as HWMonitor or HWiNFO while running the workload. Watch the CPU and GPU temperatures and see what happens shortly before the shutdown.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Check the PSU&#8217;s age and condition.<\/b><span style=\"font-weight: 400;\"> If the PSU is more than five years old and the shutdowns have only recently started, ageing components are worth considering.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Reduce the workload temporarily.<\/b><span style=\"font-weight: 400;\"> Lowering the GPU power limit or running a less demanding task can help. If the workstation remains stable for longer, power or thermal limits become stronger possibilities.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Swap-test the PSU.<\/b><span style=\"font-weight: 400;\"> If you have access to a suitable, known-good PSU, testing with it can provide a much clearer answer. If the shutdowns disappear with the replacement PSU, you&#8217;ve got strong evidence that the original PSU is the cause.<\/span><\/li>\n<\/ol>\n<p><span style=\"font-weight: 400;\">If you need a suitable PSU for testing or replacement, you can<\/span><a href=\"https:\/\/bulkdevices.co.uk\/power\"> <span style=\"font-weight: 400;\">browse our full range of power supplies<\/span><\/a><span style=\"font-weight: 400;\">.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Symptom_Likely_Cause_Fix_Quick_Reference\"><\/span><b>Symptom, Likely Cause &amp; Fix Quick Reference<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n<table id=\"tablepress-21\" class=\"tablepress tablepress-id-21\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\"><strong>Symptom<\/strong><\/th><th class=\"column-2\"><strong>Likely Cause<\/strong><\/th><th class=\"column-3\"><strong>Fix<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Shuts down under GPU\/CPU load but works normally at idle after a hardware upgrade<\/td><td class=\"column-2\">Undersized power supply<\/td><td class=\"column-3\">Upgrade to a PSU with suitable capacity and headroom<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Shuts down after several minutes of heavy work, with fans becoming loud beforehand<\/td><td class=\"column-2\">Thermal shutdown<\/td><td class=\"column-3\">Clean dust, improve airflow, and check thermal paste<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">System worked for years and has only recently started shutting down<\/td><td class=\"column-2\">Aging PSU capacitors<\/td><td class=\"column-3\">Test with a known-good PSU and replace the unit if confirmed<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Shuts down suddenly during peak power spikes<\/td><td class=\"column-2\">OCP tripping<\/td><td class=\"column-3\">Check PSU capacity and look for a component drawing excessive current<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\"><\/td><td class=\"column-3\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-21 from cache -->\n<h2><span class=\"ez-toc-section\" id=\"Common_Mistakes_When_Diagnosing_This\"><\/span><b>Common Mistakes When Diagnosing This<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><span style=\"font-weight: 400;\">The easiest mistake is assuming that the PSU is always responsible. Sometimes it is, but replacing it immediately can waste money if overheating is actually causing the shutdown.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Cooling problems deserve attention too. Dust, restricted airflow, and old thermal paste are simple things to overlook, especially when a workstation has been running without maintenance for a long time.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Another useful step is swap-testing before buying replacement hardware. If you have access to a suitable spare PSU, using it temporarily can tell you much more than simply guessing which component is responsible.<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"FAQs\"><\/span><b>FAQs<\/b><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><b>Why does my PC only shut down under heavy load, not at idle?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\">Heavy workloads increase both power consumption and heat output. If the PSU cannot handle the additional demand or the cooling system cannot control the temperature, the computer may shut down. Idle workloads don&#8217;t put the same pressure on either system.<\/span><\/p>\n<p><b>How do I know if my power supply is too weak for my build?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\">Use a <\/span><b>power supply wattage calculator<\/b><span style=\"font-weight: 400;\"> to estimate your system&#8217;s requirements, then compare the result with the PSU&#8217;s continuous rated output. Leave some extra capacity rather than choosing a supply that is right at the calculated limit.<\/span><\/p>\n<p><b>Can an old power supply cause random shutdowns even if it hasn&#8217;t failed?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\">Yes. PSU components can gradually lose performance with age. A supply may continue working during normal tasks but become unstable when the system demands more power.<\/span><\/p>\n<p><b>What&#8217;s the difference between thermal shutdown and a power supply shutdown?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\">A thermal shutdown occurs when a component reaches an unsafe temperature and the system switches off to protect the hardware. A PSU-related shutdown can happen when the supply cannot provide stable power or when one of its protection circuits, such as OCP, is triggered.<\/span><\/p>\n<p><b>Is overcurrent protection tripping a sign my PSU is broken?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\">Not necessarily. OCP is designed to shut the PSU down when current goes beyond a safe level. Repeated trips should be investigated because they can point to an undersized PSU or a hardware component drawing too much current.<\/span><\/p>\n<p><b>Should I upgrade my PSU wattage or check for a thermal problem first?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\">Start by checking the shutdown pattern and monitoring temperatures during a demanding workload. If temperatures remain reasonable but the workstation suddenly switches off, the PSU becomes a stronger suspect. If temperatures climb steadily before the shutdown, focus on cooling and airflow first.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you&#8217;ve gone through these checks and an undersized or ageing PSU appears to be the likely cause, take a look at your replacement options before buying anything. BulkDevices carries power supplies across different desktop and workstation wattage classes, including compact desktop units and higher-capacity workstation supplies. This makes it easier to choose a PSU that suits your actual hardware rather than simply buying the highest wattage available.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You can<\/span><a href=\"https:\/\/bulkdevices.co.uk\"> <span style=\"font-weight: 400;\">see the full range at BulkDevices<\/span><\/a><span style=\"font-weight: 400;\"> and compare the available options before making your decision\u00a0<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer: If your workstation works normally when you&#8217;re doing light tasks but suddenly turns off when you start rendering, exporting, gaming, or running a demanding CAD job, the power supply (PSU) and cooling system are the first places to look. An undersized power supply, overheating, ageing PSU capacitors, or overcurrent protection (OCP) can all [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":242,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16,6,7],"tags":[],"class_list":["post-162","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-power-supply","category-blog","category-networking"],"_links":{"self":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/162","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/comments?post=162"}],"version-history":[{"count":3,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/162\/revisions"}],"predecessor-version":[{"id":245,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/posts\/162\/revisions\/245"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/media\/242"}],"wp:attachment":[{"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/media?parent=162"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/categories?post=162"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bulkdevices.co.uk\/blog\/wp-json\/wp\/v2\/tags?post=162"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}