Asus M5A99X EVO with FX 8150 in trouble
After my wife asked me several times to upgrade her PC from Win7 to Win10 I managed to do it this week. The PC was running fine for about 7 years now with Win7 and never had any trouble. She will use it for web, mail and office, therefore it's still fast enough. However, after I have installed Win10 and drivers I have installed the same AV software which was running on Win7 and it crashed immediately, no matter how many times I have repeated the installation process.Then I started to use hwinfo, cinebench and prime95 to check if I can see any trouble and found it after only a few minutes.
The windows power settings are set to high performance, the CPU should run between 3.6 and 4.2 GHz with default BIOS settings. If the PC has just been turned on everything is fine during 1 or 2 CB runs. Hwinfo was running all the time and after 3-4 runs the frequency will drop to 1.4 GHz on all cores for a few seconds before it changes back to 3.6 GHz. This will happen again and again. Then I tried to set everything manually in the BIOS by disabling all power limitations, turbo, CnQ, set the core voltage to 1.45v at 4.2 GHz on all cores and LLC to very high (otherwise it drop to much). Same result in Windows, frequency drop to 1.4 GHz. After a few tests I managed to keep it stable at 4.2 GHz with a voltage of 1.375v for about 10 CB runs. This should be fine for the suggested usage of this PC, but I still don't know the reason why this will happen? What is broken? The PC never was OC before and stable all the time.