P5W DH - Game instabilty over 420 FSB

[TL1000S]

I build a lot of PC's (for tweaking/testing/fun)... They are considered stable by me when running dual prime for hours/3DMarknn (looping)..
Many of these systems must be "downclocked" after selling them to guys(boys) that uses the PC's for gaming.
Games.. ecpecially those games that stresses the whole system are probably the best test for stablity..
It must also be said that not all uses their systems in a relatively cold cellar (like me)..