i7 8700K experiencing overclocking problems at 4.8 GHz
i7 8700K experiencing overclocking problems at 4.8 GHz
I'm having a problem with my overclocking setup. Even after reaching 4.8ghz, during stress tests or video rendering the clock drops to 4.3 - 4.4ghz. Could someone help me understand what's going on? I own two PCs with the same processor but different motherboards. On one, the CPU stays at 4.9ghz all the time, regardless of conditions. Here are the specs:
Motherboard Name MSI Z370-A Pro (MS-7B48)
Video Adapter GeForce GTX 1080 Ti (11 GB)
CPU: Intel Core i7-8700K
The AVX configuration in BIOS appears to be the issue. When running AVX programs, the downclocks adjust based on the BIOS settings—such as clock speeds changing from 4.9ghz with AVX=2 to 4.7ghz with AVX=3. This pattern repeats.
I encountered a similar situation with my 8600k, where lowering the AVX setting to 1 was necessary for stress testing. As a result, I see a clock speed of 4.8ghz instead of the expected 4.9ghz in AIDA64. Although AVX is disabled in prime95 version 26.6, Intel XTU still shows full speed. It’s unclear whether reducing AVX too much is advisable, especially since AVX is likely important for video processing or rendering tasks. Someone else might have better insight on this.
Verify the multi-core performance enhancement in BIOS. If it's not turned on, the CPU will adjust its frequency based on the number of active cores. Six active cores result in a 4.3Ghz output. https://www.gamersnexus.net/guides/3077-...700k-8600k
Review the multi-core performance enhancement option in BIOS. If it's not turned on, the CPU will reduce its frequency based on the number of active cores. Having 6 active cores should result in a 4.3Ghz performance. https://www.gamersnexus.net/guides/3077-...700k-8600k
Appreciate your assistance, though enabling EIST in BIOS remains challenging. Here are some photos: https://imgur.com/a/vTf6q
Also keep an eye on the TEMPERATURE. It's unclear when it will throttle, but I'm sure it's likely above 90degC, and Intel advises maintaining it below 80degC for optimal performance. The MCP might be the cause, so try adjusting the BIOS settings and other related parameters. Be careful with the VOLTAGE—it should not be excessively high, as this is shown by the temperature readings; if it exceeds 80degC, consider fine-tuning... which could even require pushing closer to 4.6GHz (all cores) if the cooler can't cope.
Thank you for the assistance, but when I mentioned to SkyNet I couldn't turn on EIST in the BIOS... and I couldn't locate the MCP setting anywhere.
The AVX configuration in BIOS seems to be affecting performance. When running AVX programs, clock speeds change depending on the BIOS setting—for example, a 4.9ghz clock with AVX set to 2 drops to 4.7ghz, and at 4.9ghz with AVX at 3 it falls to 4.6ghz.
I encountered a similar issue with my 8600k, where lowering the AVX setting to 1 was necessary for stress testing. This resulted in a clock speed of 4.8ghz instead of the expected 4.9ghz in AIDA64. Although I disabled AVX in prime95 version 26.6 to achieve full speed during testing, Intel XTU appears to disregard that change.
I’m not sure if lowering AVX too much is advisable, especially since AVX is commonly used in video processing and rendering. Others might have better advice on this matter.