The core speed is fluctuating even when the system is off. Assistance is needed.
The core speed is fluctuating even when the system is off. Assistance is needed.
Hi!
Apologies for the English issues. I chose to modify the OC 8700k on an Asus Maximus X Hero board and followed this tutorial:
View: https://www.youtube.com/watch?v=pbRauc8gpQM&t=875s
Additionally, if you're not confident, I also reviewed Der8auer's guide – it’s quite similar (around 99%) –
View: https://www.youtube.com/watch?v=CoUtA7DKXhU
Everything seems okay. I didn’t win a silicon lottery because I could only get 4.8 with 1.28 LLC6 AVX1 or 4.9 with 1.32 LLC6 AVX1. I managed to set up a stable base, etc. The issue lies in the AVX negative offset.
How it should function (my understanding) – if the PC detects AVX instructions, programs, games, or tests will activate AVX negative offset and reduce speed by -100 (I enabled AVX1). Or it may drop core speed to -200 if AVX negative offset is set to 2.
So in stress tests with AVX, I expect a drop from 4.9GHz to 4.8GHz and then back to 4.9GHz steadily.
But the problem appears when testing without AVX: core speed swings between 4.8 and 4.9 every couple of seconds during stress tests, and it doesn’t maintain 4.9GHz consistently. The most notable part is even in idle mode (no extra programs, just a clean desktop), the speed still fluctuates and fails to hold 4.9GHz. I repeatedly see core speeds jumping from 4.9 to 4.8 over 2-4 seconds, then briefly settling at 4.8 for a second before rising again to 4.9.
This inconsistency is due to AVX. If I disable AVX, the system becomes unstable with AVX programs, and I need higher core speeds – which isn’t worth it since my results are already quite good on this chip.
Also, I know from the time code (15:04) and Der8auer’s guide (10:02) that core speed should remain stable at the set GHz (e.g., 5000) only when AVX is active during testing. Some forums suggest it might be related to Windows 10 also supporting AVX, though that seems unlikely given consistent results across different motherboards.
Bios version – last update, before I applied the OC, CMOD was enabled, stock settings reset, and a BIOS update was done. After that, I strictly followed the first tutorial video (but also checked Der8auer’s instructions).
In Windows 10, set Maximum Performance.
I need someone to clarify what’s wrong and how to fix these fluctuations with AVX in idle mode.
PC:
8700k
Asus Maximus X Hero (Wi-Fi AC)
1080ti
G.skill Tridentz RGB 3200 4x8 CL14
Seasonic Prime 850W
I also enjoy BoostedMedia's OC tutorials for the 8700k, is SpeedStep active? If yes, that probably explains your idle changes, and to be honest, 100Mhz isn't something you need to stress about.
I don't have real-time monitoring capabilities, so I can't provide current CPU temperatures. You'll need to check the system's temperature display or use a monitoring tool to see idle and load temperatures.
Idle 32-34c, bench 65-71c mid, 87 highest in spikes. Verified using OCCT/RealBench/Cinebench/Aida.
I also enjoy BoostedMedia's OC tutorials for the 8700k, isn't SpeedStep active? If yes, that's probably what's leading to your idle changes, and to be honest, 100Mhz isn't something you need to stress about.
you could also be reaching the 95 Watt limits and power boundaries... those (and operating at full turbo speed) would definitely require removal to keep the maximum speeds going forever, unless the mainboard's VRM temperature stays within safe ranges...