AVX offset on ASUS Maximus XI CODE

[BlackMax998877]

Hi. On my ASUS Maximus XI CODE in the Bios I set the AVX offset to 0. When in Widows my CPU (overclocked to 5GHZ - 9900K) runs stable at 32 degrees at idle. When I run an AVX intensive program like Prime95 the CPU speed drops to 4.5ghz on all cores. When I go back to the Bios and set the offset to 1 the AVX load in Windows drops to 4400ghz and when to set to 2 the CPU drops to 4.3GHZ. There is always 500mhz that the Bios adds ontop of the AVX offset. Even when the AVX is set to 0, the CPU will drop from 5GHZ to 4.5GHZ when Prime95 is run. The LLC is set to 6 (I have tried other values and makes no difference).

 

Even more frustrating is that when I have an AVX value greater than 0 the CPU speed in windows (even when at idle) will fluctuate between the overclock speed and the AVX offset. So just at idle with an AVX offset of 3 the CPU clock will go up and down from 5GHz to 4.7GHz every second. Speedstep is disabled. MCE is disabled. Windows power managment is set to the highest value. I have tried to set the VCORE to adaptive / auto and a fixed value. Makes no difference.

 

When I set AVX to 0 and run games and stress tests the system is stable at 5GHZ. I am starting to wonder if there is something loaded at idle on the desktop that runs in the background that the mobo thinks is AVX and thats why the speed goes up and down between the overclocked speed and the AVX offset.

 

System Spec:

CPU - 9900K

MOBO - ASUS Maximus XI CODE  (latest BIOS)

850W corsair powersupply

RAM - Corsair Dominator Plat 3200mhz overclocked to 3400mhz

 

 

[Falkentyne]

Yes thats exactly it.  Some windows service or driver.

[BlackMax998877]

I have googled what typical service (programs) uses AVX and nothing I use came up. Will probably have to reinstall windows and then install 1 app at a time to see what causes the AVX to be running in the background permanently.

[BlackMax998877]

Reinstalled windows. Didn't make a differnce.