is there something wrong with my hardware

[Andy_pandy]

I tried Prime95 on custom settings on my PC and I checked the task manager. It says 94% CPU usage and my frequency downgraded to 3.5Ghz from 4GHZ stock.

I also realized my PC restarts. It's not a BSOD. If it was, it would have stayed on the BSOD screen since I unchecked automatically restart under system failure menu.

I updated all my of drivers to Windows 8 drivers.

I also heard from someone it's that it has to do with the Power Phase Design.

This is my custom setting.

Toture test settings:
Min FFT size(in K) 128
Max FFT size(in K) 5000
Memory (in MB) to use 6000

Here are my Pc sepcs

CPU: AMd FX 8350 4GHZ ( Stock, not overclocked)
GPU: AMD 6870 (not overclocked)
RAM: 8GB Corsair Dual Channel
Motherboard: ASUS M5A97 R2.0
PSU: XFX 450W
Samsung 830 128GB SSD
500GB Wester Digital
OS: Windows 8

 

[mmj_uk]

What cooler are you using and what temps do you get in HWMonitor? mine barely stays below AMD recommended settings in P95 at stock using a Noctua NH-D14, so the stock cooler will be useless I'd imagine.

Are you sure you don't have an FX8320? because 4ghz in light load and 3.5ghz under heavy load is normal for that chip.

 

[eddyr]

What cpu temps? Shouls always monitor temps when doing stress tests, try CoreTemp, or RealTemp.

If it is to do with the vrms then sitting a fan blowing over them and running prime should show it up. Keeping them cooler will help them provide stable power and reduce the likelihhod of throttling.
Reducing cpu volts can also help by lowering the demand on the vrm's keeping heat down (assuming it is still enough to run error free ofcourse, no point getting a new issue while alleviating another).

 

[Devrij]

I had this issue with Win8 on my 2500K and P67 board where it would downclock from 4.2GHz to 3.8GHz under load (temps were fine, had been stable for 2 years), but don't with my 3570K and Z77x. I have no idea what was causing it, and I never fixed it before dumping that stuff into my gfs win7 build. I would try updating your BIOS maybe?

 

[Andy_pandy]

Thanks for the reply, guys. Yes I did update all BIOS. Mmj_uk, I have FX 8350 at 4Ghz. Lol, I'm looking at the box as I'm typing this.

Funny thing is, this only happens in Windows 8, not Windows 7. I tried on Windows 7 and there is not restarting, BSOD. Task Manager on Windows 7 says my CPU is in 100% use.

 

[mmj_uk]

It must be throttling then, what are your temps? not sure why it would only affect Windows 8 though.