Random BSOD/Restarts only in Games

[aenama]

Sometimes I can play days and it doesn't occure. But then the black screens
always come back. There is no error on the screen. Just black. I disabled the option to restart when system failure. Still no error screen.
I haven't got a clue what it could be. The BSOD's occures with several games so it's not game related.

I have tested the following:
Videocard (asus 7900 GT) : 3dmark ---> OK
Hard disc ---> OK
CPU - Stress test (2 X 3.4) --> OK
Intern memory (1gb) --> OK
Temperaturs --> OK

The motherboard is a p5nSLI (Asus).

I included a few minidumps. I only got two. Not always a dump is created.

Who can help me?

 

[peterdiva]

One of the dumps is giving a hardware error. If you have two sticks of RAM, run one at a time to see if it still crashes. Try a different slot if you only have one.

BugCheck 1000000A, {300000c4, 1c, 0, 80502583} <-- Hardware error.
Probably caused by : ntkrpamp.exe ( nt!KiFindReadyThread+d7 )