8700K delid - high temperatures - require guidance
8700K delid - high temperatures - require guidance
PC-GAMER_1: CompuTronix: PC-GAMER_1:... 8700k 5ghz delid LM dark rock pro 4... 1.28v - 70-78c - Unstable in Prime95 using small fft... PC-GAMER_1, Which version of Prime95 was used? PC-GAMER_1:... it worked smoothly at 1.33v with all cores at full capacity, yet temperatures reached 95°C... I've searched extensively online but haven't found a solution. - I'm aware of the AVX offset feature in Prime95... Have you come across this information during your research? Intel Temperature Guide -... Thank you for your reply and the link – I'll review it. PC-GAMER_1, The typical operating temperature range is: Temperatures exceeding 85°C are discouraged. Temperatures under 80°C are preferred. "Stress" evaluations differ significantly and can be split into two types; stability tests with varying workloads, and thermal tests with constant loads. Intel assesses performance under a consistent 100% power draw to confirm thermal specs. Prime95 version 26.6 Small FFT's is optimal for CPU thermal analysis, as it maintains a steady 100% load, keeping Core temps close to the TDP range for i series chips like your 8700K within ± a few percent. No other program matches Prime95's testing setup closely. • Prime95 v26.6 (non-AVX) - http://www.mersenneforum.org/showthread.php?t=15504 Tools that avoid overloading or underloading the CPU will offer reliable thermal data. Here’s a comparison grouped by thermal and stability tests, averaged across six generations at standard settings, rounded to the nearest 5%: Observe the extreme 130% TDP scenario in Prime95 v29.4 (top left) versus v26.6 without AVX. All evaluations will display 100% CPU utilization in Windows Task Manager, reflecting processor activity rather than % TDP. Core temperatures should stay under 85°C for optimal performance. Temperatures below 80°C are considered ideal. "Stress" tests vary widely and can be divided into two categories; stability tests with fluctuating loads, and thermal tests with steady loads. Intel benchmarks processors at full capacity (100% TDP) to verify Thermal Specifications. Prime95 v26.6 Small FFT's is perfect for CPU thermal evaluation, since it delivers a consistent 100% load, allowing Core temperatures to stay within typical ranges for Hyperthreading variants such as your 8700K, around the TDP margin. Other utilities that don’t overload or underload the processor will provide a solid thermal baseline. Here’s a breakdown of tools categorized by thermal and stability tests, based on % of TDP, averaged across six generations at default settings, rounded to five percent: Be aware that the 130% TDP scenario in Prime95 v29.4 (upper left) is due to AVX usage, unlike v26.6 which does not include it. Utilities that manage CPU load effectively will yield accurate thermal readings. If you encounter a significant performance drop when AVX is enabled, it may indicate an issue with the test configuration. Yes, but the phrasing used by some users seems inconsistent, as "they" might have mixed up "off" and "on." Let's examine this more closely: For 4th through 9th Gen i9, i7, i5, and i3 processors, AVX instruction sets are available. Later Prime95 versions execute AVX code on the CPU’s FPU, creating a workload that can raise core temps by up to 20°C. Many 6th through 9th Gen motherboards mitigate this by offering "offset" adjustments (downclocking) in BIOS. Because AVX-heavy tasks demand substantial power, running at 3 (300 MHz) or higher may be necessary to keep clock speeds stable and core temps below 85°C. Remember, lower core temperatures generally mean better stability. Even without AVX-intensive applications like rendering or transcoding, BIOS should support them—tools such as Asus RealBench use realistic AVX workloads for testing. Some motherboards lack proper AVX offset handling, or the offset is set too low with a fixed Vcore, leading to instability and BSODs. However, when the offset functions correctly and BIOS is properly configured, downclocking helps maintain stability during AVX execution. AVX can be disabled in Prime95 versions after 26.6 by adding "CpuSupportsAVX=0" to the local.txt file. But since core temps remain similar, it’s simpler to stick with version 26.6. According to Intel’s specifications, TDP and thermal specs are confirmed without AVX support. 8th and 9th Gen Intel® Core™ Processor Datasheet, Volume 1 - https://www.intel.com/content/www/us/en/...vol-1.html Refer to page 87 – Thermal Management, Section 5.1.1 – Thermal Considerations, starting with the first paragraph.
Yea I agree with what CompuTronix shared.
You were using a newer Prime 95 version that supports AVX instructions. If your BIOS lacks AVX offset (usually -3), you're effectively running at around 5.3 GHz during stress tests.
At this point, the recommended action is to upgrade to Prime 95 version 26.6 and perform short FFT tests for 2 to 6 hours. You should notice a significant drop in temperature.
My 8700k (not delidded) is also operating at about 5.0 GHz with a 1.25 Vcore, though chip variations exist. During the Prime95 26.6 small FFT test, temperatures hover between 68 and 70°C. I'm using an Evga CLC 280 with push-pull configuration.
CompuTronix: PC-GAMER_1:... 8700k 5ghz delid LM dark rock pro 4... 1.28v - 70-78c - Unstable in Prime95 using small fft... PC-GAMER_1, Which version of Prime95 was used? PC-GAMER_1:... stable at 1.33v with all cores at 100% but temperatures reached 95c... I attempted research extensively online yet found nothing. - I believe it involves avx offset, as Prime95 employs it?... Checked the Intel Temperature Guide -... Appreciate your reply and the link – I’ll review it. PC-GAMER_1, The standard operating temperature range for the core is: Temperatures over 85°C are discouraged. Core temps under 80°C are preferred. "Stress" tests differ significantly and can be split into two types; stability tests with fluctuating workloads, and thermal tests with constant workloads. Intel evaluates processors under a consistent 100% TDP load to confirm Thermal Specifications. Prime95 version 26.6 Small FFT's is optimal for CPU thermal evaluation, as it provides a steady 100% workload, keeping Core temperatures close to the TDP range for variants like your 8700K, typically within a few percentage points. No other tool matches Intel’s testing conditions closely. • Prime95 v26.6 (non-AVX) - http://www.mersenneforum.org/showthread.php?t=15504 Tools that avoid overloading or underloading the processor will offer a reliable thermal baseline. Here’s a comparison grouped by thermal and stability tests, averaged across six CPU generations at default settings, rounded to the nearest 5%: Observe the extreme 130% TDP workload from AVX in Prime95 v29.4 (top left) versus v26.6 without AVX. All assessments will display 100% CPU utilization in Windows Task Manager, reflecting processor activity, not % TDP. Core temperatures react directly to power consumption (Watts), which is driven by the workload. Prime95 v26.6 Small FFT’s delivers a consistent 100% workload, meaning if core temps stay below 85°C, your processor should handle demanding real-world tasks without overheating. PC-GAMER_1:... I’m using version 29.4 and have read about disabling AVX to stop BSODs. However, when I turned it back on for stress tests, I started getting BSOD again. I understand some programs use AVX, but is it a valid test if you switch it off and then back on? Yes, though the explanation seems mixed, as "they" described their experience in a way that contradicts AVX’s intended function. Could it be a mix-up between 'off' and 'on'? Let’s examine closely: 4th through 9th Gen i9, i7, i5, and i3 CPUs support AVX Instruction Sets. Later Prime95 versions run AVX code on the CPU’s FPU, creating an unrealistic workload that can raise core temps by up to 20°C. Many 6th through 9th Gen motherboards mitigate this with 'offset' adjustments (downclocking) in BIOS. Because AVX workloads demand high performance, -3 (300 MHz) or higher may be necessary to lower clock speeds and keep core temps at 85°C or below. Remember, lower core temperatures generally mean better stability. Even without AVX applications like rendering or transcoding, the BIOS should still support them—tools such as Asus RealBench use realistic AVX workloads for stability checks. Some motherboards lack proper AVX offset handling, or it may be misconfigured with a low Vcore (3 or 300 MHz) that compromises stability. Such setups can trigger BSODs. But when the offset functions correctly and BIOS is properly tuned, downclocking enables stability during AVX processing. AVX can be disabled in Prime95 versions after 26.6 by adding 'CpuSupportsAVX=0' to the local.txt file. Still, using version 26.6 remains straightforward since core temps match those of 26.6. According to Intel’s specifications, TDP and Thermal Specifications are verified 'without AVX'. 8th and 9th Generation Intel® Core™ Processor Datasheet, Volume 1 - https://www.intel.com/content/www/us/en/...vol-1.html Refer to page 87 – Thermal Management, Section 5.1.1 – Thermal Considerations, opening the first paragraph. CT Wow, thank you for this thorough explanation… it really clarifies things! You were right—I was completely unaware of this overclocking issue and mistakenly damaged my CPU. I tested Prime95 26.6 for 2–3 hours; temps stayed under 74°C at 5GHz with 1.30v. Next time I’ll experiment with voltage adjustments to see if I can lower the temperature further, but we’ll find out. It’s an exciting process, but I’ll be careful. 😉. @Thtran6 Great confirmation—it makes perfect sense! You were correct; I was misled by my initial assumptions about AVX behavior. I was worried I’d damaged my CPU, but now I understand the risks and how to manage them. I’m considering upgrading to a meshify C midi if it’s available, but my current case is too bulky for performance. My spare Corsair 540 air case isn’t ideal either. I’ll need to ensure the BIOS is set correctly, as some tools use realistic AVX workloads for stability checks (like Asus RealBench). There are motherboards with BIOS versions where AVX offset doesn’t work properly, or it’s too low, leading to instability. But when configured right, downclocking helps maintain stability during AVX execution. AVX can be turned off in Prime95 versions after 26.6 by adding 'CpuSupportsAVX=0' to local.txt. Since core temps remain the same, sticking with version 26.6 is simpler. As per Intel’s data sheets, TDP and Thermal Specifications are confirmed without AVX support. 8th and 9th Gen Intel® Core™ Processor Datasheet, Volume 1 - https://www.intel.com/content/www/us/en/...vol-1.html Page 87 – Thermal Management, Section 5.1.1 – Thermal Considerations, starts with the first paragraph.