--- title: "How to Fix PC Processor Overheating and Throttling | FixFix Labs" description: "Diagnose CPU overheating, thermal throttling, and performance issues on desktop PCs. Step-by-step desktop pc troubleshooting guide with quick checks and fix ..." lang: en json-ld: | [ { "@context": "https://schema.org", "@graph": [ { "@type": "Organization", "@id": "https://fixfixlabs.com/#organization", "name": "FixFix Labs", "url": "https://fixfixlabs.com/", "logo": "https://fixfixlabs.com/emblem.webp", "sameAs": [ "https://facebook.com/fixfixlabs", "https://instagram.com/fixfixlabs", "https://www.tiktok.com/@fixfixlabs.com" ], "alternateName": [ "fixfixlabs", "Fix Fix Labs", "FixFix Labs", "fixfix labs", "fixfixlabs.com", "FixFix Labs Luton" ], "address": { "@type": "PostalAddress", "streetAddress": "159 Marsh Road", "addressLocality": "Luton", "addressRegion": "Bedfordshire", "postalCode": "LU3 2QL", "addressCountry": "GB" }, "areaServed": "GB" }, { "@type": [ "LocalBusiness", "ProfessionalService" ], "@id": "https://fixfixlabs.com/#localbusiness", "name": "FixFix Labs", "alternateName": [ "Repair Zone", "Repair Zone Luton", "FixFix Labs Luton", "FixFix Labs" ], "url": "https://fixfixlabs.com/", "image": "https://fixfixlabs.com/emblem.webp", "telephone": "+441582505020", "email": "support@fixfixlabs.com", "priceRange": "££", "parentOrganization": { "@id": "https://fixfixlabs.com/#organization" }, "address": { "@type": "PostalAddress", "streetAddress": "159 Marsh Road", "addressLocality": "Luton", "addressRegion": "Bedfordshire", "postalCode": "LU3 2QL", "addressCountry": "GB" }, "areaServed": [ "Luton", "Marsh Road", "Bury Park", "Leagrave", "Limbury", "Biscot", "Sundon Park", "Marsh Farm", "Lewsey", "High Town", "Stopsley", "Wigmore", "Farley Hill", "Round Green", "Bramingham", "Dunstable", "Houghton Regis", "Caddington", "Slip End", "Barton-le-Clay" ], "openingHoursSpecification": [ { "@type": "OpeningHoursSpecification", "dayOfWeek": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" ], "opens": "10:00", "closes": "18:00" } ], "sameAs": [ "https://facebook.com/fixfixlabs", "https://instagram.com/fixfixlabs", "https://www.tiktok.com/@fixfixlabs.com" ] }, { "@type": "WebSite", "@id": "https://fixfixlabs.com/#website", "name": "FixFix Labs", "url": "https://fixfixlabs.com/", "publisher": { "@id": "https://fixfixlabs.com/#organization" }, "inLanguage": "en-GB", "potentialAction": { "@type": "SearchAction", "target": { "@type": "EntryPoint", "urlTemplate": "https://fixfixlabs.com/device-troubleshooting?q={search_term_string}" }, "query-input": "required name=search_term_string" } } ] }, { "@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": 1, "name": "Home", "item": "https://fixfixlabs.com/" }, { "@type": "ListItem", "position": 2, "name": "Troubleshooting", "item": "https://fixfixlabs.com/device-troubleshooting" }, { "@type": "ListItem", "position": 3, "name": "Desktop PCs Guides", "item": "https://fixfixlabs.com/device-troubleshooting#pc" }, { "@type": "ListItem", "position": 4, "name": "PC Processor Overheating and Throttling", "item": "https://fixfixlabs.com/device-troubleshooting/pc-processor-issues" } ] }, { "@context": "https://schema.org", "@type": "HowTo", "name": "PC Processor Overheating and Throttling", "description": "If your PC is stuttering, crashing, or shutting down during demanding tasks, your CPU might be overheating and throttling performance.", "url": "https://fixfixlabs.com/device-troubleshooting/pc-processor-issues", "step": [ { "@type": "HowToStep", "position": 1, "name": "Clean heatsink and fans", "text": "1. Power off and unplug PC.\n2. Use compressed air to blow dust from CPU heatsink fins.\n3. Clean all case fans.\n4. Clean dust filters.\n5. Reassemble and test temperatures." }, { "@type": "HowToStep", "position": 2, "name": "Replace thermal paste", "text": "1. Remove CPU cooler carefully.\n2. Clean old paste from CPU and cooler with isopropyl alcohol.\n3. Apply a pea-sized amount of new thermal paste to CPU centre.\n4. Reattach cooler firmly and evenly." }, { "@type": "HowToStep", "position": 3, "name": "Improve case airflow", "text": "1. Ensure front fans intake, rear/top exhaust.\n2. Add fans to empty mounting points.\n3. Improve cable management to clear airflow paths.\n4. Move PC away from walls." }, { "@type": "HowToStep", "position": 4, "name": "Monitor and test", "text": "1. Install HWMonitor or Core Temp.\n2. Run a stress test (Prime95 or Cinebench).\n3. CPU should stay below 85-90C under full load.\n4. If temperatures are still high, consider a better cooler." } ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "Did you recently change hardware?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: New components or a rebuild may have disturbed cooling. | No: Dust accumulation or degraded thermal paste over time." } }, { "@type": "Question", "name": "Does the problem only occur under heavy load?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: CPU generates too much heat for current cooling under stress. | No: Overheating at idle suggests severe cooling failure." } }, { "@type": "Question", "name": "Have you cleaned the PC in the last 6-12 months?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: Dust is less likely the primary cause. | No: Dust buildup is very commonly the cause." } }, { "@type": "Question", "name": "Are all fans visibly spinning?", "acceptedAnswer": { "@type": "Answer", "text": "Yes: Fans work but may not be effective enough. | No: A non-spinning fan needs immediate attention." } } ] } ] --- [![FixFix Labs](/assets/fixfix-logo-Dj0uNxZh.webp)](/) [Troubleshooting](/device-troubleshooting) [Luton Repairs](/repair) [Repair by Post](/mail-in-repair)[Track Repair](/track) [Custom PCs](/custom-builds) [Sign In](/login)[Start Diagnosis](/diagnosis) [](tel:01582505020) [01582 505020](tel:01582505020) 1. [All Guides](/device-troubleshooting) 2. [Desktop PCs](/device-troubleshooting?category=pc#problems) 3. PC Processor Overheating and Throttling Desktop PCs processor # PC Processor Overheating and Throttling ## Quick Answer If your PC is stuttering, crashing, or shutting down during demanding tasks, your CPU might be overheating and throttling performance. Please note: This guide is provided for informational purposes only. Any steps you choose to follow are at your own discretion and risk. If you're unsure, we recommend booking a professional diagnosis. Line illustration of a desktop tower and monitor with diagnostic reference markings, overlaid with a timing and performance trace Desktop PC — illustration On this page - [Quick Checks](#quick-checks-heading) - [Guided Troubleshooting](#diagnostic-heading) - [Possible Causes](#possible-causes-heading) - [Self-Fix Instructions](#self-fix-heading) - [Safety Warnings](#warnings-heading) - [When troubleshooting isn't enough](#next-steps-heading) ## Quick Checks Try these fast checks first — they solve most cases. 1. Check Task Manager Look at CPU usage. High usage at idle indicates background processes. 2. Listen for fan noise Loud fans indicate struggling cooling. Silent fans may have failed. 3. Feel the case temperature Very hot case panels confirm internal heat issues. 4. Observe when issues occur Problems only during heavy load point to overheating. ## Guided Troubleshooting Answer these questions to narrow down the issue. Did you recently change hardware? YesNo Does the problem only occur under heavy load? YesNo Have you cleaned the PC in the last 6-12 months? YesNo Are all fans visibly spinning? YesNo ## Possible Causes Dust accumulation Very Common Dust insulates heatsinks and blocks airflow. Old thermal paste Common Dried thermal paste loses heat transfer effectiveness. Poor case airflow Moderate Wrong fan orientation or blocked vents trap heat. CPU cooler not seated properly Less Common Uneven contact with CPU reduces heat transfer. Failing cooler fan or pump Less Common Fan or AIO pump failure causes rapid overheating. Overclocking Rare High voltages and frequencies generate excessive heat. If the cause requires professional attention, see [Get Desktop PC slow performance fixed](/repair/pc/slow-performance). ## Self-Fix Instructions Safe steps you can try at home. 1. ### Clean heatsink and fans 1\. Power off and unplug PC. 2. Use compressed air to blow dust from CPU heatsink fins. 3. Clean all case fans. 4. Clean dust filters. 5. Reassemble and test temperatures. 2. ### Replace thermal paste 1\. Remove CPU cooler carefully. 2. Clean old paste from CPU and cooler with isopropyl alcohol. 3. Apply a pea-sized amount of new thermal paste to CPU centre. 4. Reattach cooler firmly and evenly. 3. ### Improve case airflow 1\. Ensure front fans intake, rear/top exhaust. 2. Add fans to empty mounting points. 3. Improve cable management to clear airflow paths. 4. Move PC away from walls. 4. ### Monitor and test 1\. Install HWMonitor or Core Temp. 2. Run a stress test (Prime95 or Cinebench). 3. CPU should stay below 85-90C under full load. 4. If temperatures are still high, consider a better cooler. ## Safety Warnings - Always power off and unplug before working inside the PC. - Be careful removing coolers. Dried thermal paste can pull the CPU from its socket. - Do not run the PC without a cooler attached to the CPU. - If using an AIO cooler, check for pump failure (touch the pump block to feel for vibration). ## When troubleshooting isn't enough If these steps didn't resolve the issue, a professional diagnosis can identify the root cause. [Start Diagnosis ](/diagnosis?category=pc&issue=slow-performance)[Get Desktop PC slow performance fixed ](/repair/pc/slow-performance) ### Still need help? FixFix Labs repairs devices in Luton. Walk in to 159 Marsh Road, Luton, LU3 2QL — or book a slot online. Same-day service on most common repairs. [Free AI Diagnostic](/diagnosis) [Book a Repair](/booking)[Phone Repair Luton](/phone-repair-luton) [Call 01582 505020](tel:01582505020) [View all desktop pc troubleshooting guides](/device-troubleshooting?category=pc#problems) FixFix Labs is not responsible for pre-existing data loss or undisclosed damage. All repairs carry inherent risk. 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