Ok, recently I had to change my motherboard and PSU as one of the contacts on the power supply which plugs into the motherboard had completely burnt out the pin on both the PSU and motherboard. So I replaced both the PSU and motherboard and also got a new graphics card.
However since replacing all this I now have a situation whereby in games the system will either freeze or reboot after 5 - 10 minutes. The two graphics cards I've test it with are XFX Geforce 7800GS (new card) and Radeon X800XT PE and the problem occured on both graphics cards so I've deduced that it isn't the problem.
However the PSU should be more than upto the job as it is a hiper 580W jobby and the voltages seem more than stable when I'm looking at them and the system is nowhere near overheating when this problem occurs.
It seems strange that the problem only occurs in games and not in windows when I have tested it with both graphics cards and both give an identical problem.
Any ideas appreciated
edit: thought I should add specs:
proc P4 3Ghz Prescott
mobo Abit AS8-V
ram 4 x 256Mb Geil Value
However since replacing all this I now have a situation whereby in games the system will either freeze or reboot after 5 - 10 minutes. The two graphics cards I've test it with are XFX Geforce 7800GS (new card) and Radeon X800XT PE and the problem occured on both graphics cards so I've deduced that it isn't the problem.
However the PSU should be more than upto the job as it is a hiper 580W jobby and the voltages seem more than stable when I'm looking at them and the system is nowhere near overheating when this problem occurs.
It seems strange that the problem only occurs in games and not in windows when I have tested it with both graphics cards and both give an identical problem.
Any ideas appreciated

edit: thought I should add specs:
proc P4 3Ghz Prescott
mobo Abit AS8-V
ram 4 x 256Mb Geil Value