It seems stable to me but I am no expert, I may well try to run the test that you suggest.
I have run many applications without crashing including playing battlefield 2142 for about four hours solid. The pc has been on solid for a week no problem.
The Vcore is at 1.45v with the idle on the cpu temperature about 31degrees c.
The cpu temp never goes above 49 degrees, it did go up to 58 degrees but fitting the asus silent square and an extra fan took care of that.
What about my memory, how do I change that for best results?
AMD 64 x2 4600+ Socket 939 @ 2850Mhz/238Mhz V Core 1.45
Thermaltake Mambo VC 2000
Asus Silent Square (Excellent)
2x 1GB DDR 400 3200
I Green Power 600W Power
BFG 7950 GT OC @ 580Mhz/723