CPU clock decreases to 4.4 GHZ during stress tests
CPU clock decreases to 4.4 GHZ during stress tests
I increased my i7 7700K to 4.8 GHZ with the profiles already set on my motherboard (MSI Gaming M7) and adjusted the DRAM frequency to 3000 mhz. During stress testing with AIDA64, before the tests began I observed a clock speed of 4800 mhz, but it dropped to 4400 mhz once the test started. The reason for this change is not specified in the provided context.
Okey, I think I found the problem. There is a
"CPU Ratio offset when running AVX"
option in the BIOS. It's an offset to lower clock multiplier when running AVX instructions to reduce heat, but I guess it doesn't even look at heat, it just drops clock whenever an AVX instruction is executed. It's value was -4, I set it to 0 and run the stress test again, clock speed stayed same.
Now I got the real temps, max. temp is 85 C (%0 throttling) which I think is pretty cool. I love this CPU cooler lol. Although it works like a jet motor when it's at full speed, there is no need to run it at full so it's not a problem.
I increased my i7 7700K to 4.8 GHZ with the profiles already set on my motherboard (MSI Gaming M7) and adjusted the DRAM frequency to 3000 mhz. During stress testing with AIDA64, I noticed the clock initially showed 4800 mhz but dropped to 4400 mhz once the test began. It might be due to temperature effects causing downclocks.
The temperatures of your CPU and VRMs are probably the main issues. Improved cooling could make a difference. What were your CPU temperatures during stress tests? You can't measure VRM temps, but if your CPU temps are stable (around 80°C or lower), then the VRMs are likely the next suspects.
The CPU temperatures and VRMs are probably the main issues. Improved cooling would likely help. What were your CPU temperatures during stress tests? You can't measure VRM temps, but if your CPU temps stay at 80°C or below, then the VRMs are likely the next suspects. I don’t have a heat problem—I’m using a Corsair H115i and monitoring the temps. They stay under 65-70°C, and the clock speed decreases once the stress test starts. I’ve benchmarked with Intel Extreme Tuning Utility; the clock speed dropped too, ranging between 4400 and 4800 MHz, which suggests it was functioning properly and passed. The highest recorded temperature was 69°C.
It seems like you're dealing with your VRMs and mosfets. They tend to overheat, which can cause your CPU to slow down. This often results in a lower score during Intel's burn test, even though a higher clock speed might seem better. The issue is that the VRMs/mosfets struggle to maintain stable voltage, leading to underperformance during heavy workloads. My i7 970 and i7 3930K both show this problem—higher overclock attempts don’t always improve scores. I usually stick to around 4.2GHz and run it continuously. When VRMs/mosfets get too hot, they limit CPU performance. Adding a fan or using water cooling can help. Unfortunately, you can't easily check VRM/mosfet temperatures on the motherboard; you might need an IR thermometer to measure them accurately. Trying a lower overclock and seeing how it performs in Intel’s burn test (around 4.3-4.7GHz) could give clues. If that doesn’t help, it’s likely a cooling issue.
Okey, I think I found the problem. There is a
"CPU Ratio offset when running AVX"
option in the BIOS. It's an offset to lower clock multiplier when running AVX instructions to reduce heat, but I guess it doesn't even look at heat, it just drops clock whenever an AVX instruction is executed. It's value was -4, I set it to 0 and run the stress test again, clock speed stayed same.
Now I got the real temps, max. temp is 85 C (%0 throttling) which I think is pretty cool. I love this CPU cooler lol. Although it works like a jet motor when it's at full speed, there is no need to run it at full so it's not a problem.