Prime95: Extremely high temperatures on 4770k Non-OC and with OC
Prime95: Extremely high temperatures on 4770k Non-OC and with OC
Hello everyone
I recently upgraded my 4690 to a 4770k, thinking it was a budget-friendly choice given the 8 threads and overclocking capability.
But I’m experiencing extremely high temperatures during stress tests with Prime 95 (Small FTTs), both when I didn’t overclock and when I did.
Without overclocking, I reached up to 86°C after just one minute...
I’ve tried reapplying the thermal paste and even remounting the cooler, but nothing really helped.
With overclocking, the temps stayed around 87°C for a short time.
The cooler is spinning at about 1600 RPM in both cases.
I’ve attempted to overclock before, but these temperatures are way beyond what I expected.
What should I do?
Am I just unlucky with my CPU chip selection?
Here’s the link to the specs and setup:
https://gyazo.com/ae6d557152517dd41697bb563135a8d5
Details: Intel Core i7-4770k, Hyper 212 Evo cooler, various RAM and storage configurations.
EmilAblaa
,
Do NOT run any versions of Prime95 later than 26.6. Here's why:
Core i 2nd through 6th Generation CPU's have AVX (Advanced Vector Extension) instruction sets. Recent versions of Prime95, such as 28.9, run AVX code on the Floating Point Unit (FPU) math coprocessor, which produces
unrealistically high temperatures
. The FPU test in the utility AIDA64 shows similar results.
Prime95 v26.6 produces temperatures on 3rd through 6th Generation processors more consistent with 2nd Generation, which also have AVX instructions, but do not suffer from thermal extremes due to having a soldered Integrated Heat Spreader and a significantly larger Die.
Please download
Prime95 version 26.6
-...
EmilAblaa, Avoid executing any Prime95 versions beyond 26.6. Here’s the explanation: CPUs from the 2nd to 6th generation support AVX instruction sets. Newer Prime95 releases, like 28.9, execute AVX code on the FPU math coprocessor, leading to excessively high temperatures. AIDA64 testing confirms this trend. Prime95 v26.6 generates temperatures closer to those of 2nd generation CPUs, which also feature AVX but avoid thermal spikes because they include a soldered Integrated Heat Spreader and a larger die. Download Prime95 version 26.6 - http://windows-downloads-center.blogspot...5-266.html Limit FFT operations to 10 minutes. Utilize Core Temp to monitor your temps - http://www.alcpu.com/CoreTemp Expect temperatures 10 to 20°C lower with v26.6 compared to v28.9. Please refer to Tom’s Sticky: Intel Temperature Guide - Thanks, CT
CompuTronix: EmilAblaa, Please avoid executing any Prime95 versions beyond 26.6. Here’s the explanation: Processors from the 2nd to 6th generation with AVX instruction sets are affected. Newer Prime95 releases, like 28.9, execute AVX code on the FPU math coprocessor, leading to excessively high temperatures. The AIDA64 test confirms this behavior. Prime95 v26.6 generates temperatures closer to those of 2nd generation CPUs, which also support AVX but avoid thermal spikes thanks to a soldered heat spreader and a larger die. Download Prime95 version 26.6 - http://windows-downloads-center.blogspot...5-266.html Limit Small FFT operations to 10 minutes. Utilize Core Temp to monitor your temps - http://www.alcpu.com/CoreTemp Expect temperatures to be 10 to 20°C lower with v26.6 compared to v28.9. Please refer to this Tom’s Sticky: Intel Temperature Guide - Thanks, CT Thank you for your response. You were quite accurate. My readings decreased by around 16°C with the older Prime version. Now I’m reaching a maximum of 81-82°C after 20 minutes of Small FTTs at 4.2 GHz, instead of the higher 80°C+. This seems to be an optimization, and I’m fine with it.