Windows 10: Windows random crash while idle

After I leave the pc in idle, it randomly crashes after a few mins the display turns off 10 mins. It doesnt happen every time. I tried clean boot, disabling c states and changing power supply idle control to typical in bios, everything is at stock. Updated Windows and drivers gpu and chipset specially. Already tried disabling ram xmp profile, PBO and Core boost performance. Ran memtest86 and got 0 errors. I tried disabling the "turn off display after x mins" and got no crashes in 4 attempts leaving the pc idle for 15-20 mins but Im not sure if thats the problem. Got no high temps.The pc r

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all games crash!

I suggest you run rthdribl > http://www.daionet.gr.jp/~masa/archives/rthdribl_1_2.zip
Increase the window size step by step and watch your vga temps permanently.
What happens?
If it crashes, run at stock speeds as suggested before and retry.

P.S.: When your system locks, does the display signal turn off after a time?
Stuttering sound or no sound at all when freezing?
What X1800XT model do you own exactly?

 

Random Crashes

Check the rig in my system specs.

I've been dealing with random crashes, while the computer is sitting idle in windows with only Firefox open. They aren't BSOD's or GSOD's.

Also, lately I can't even get 4GHz stable, I'm running at 3.8 right now.

Temps: CPU 40 GPU 27

 

all games crash!

ive watch my temps and both the cpu and gpu are within normal ranges. when it freezes it simply freezes the image and stops the sound. i must reboot to get back to windows.