I kindly ask your opinion on what follows.

I have the following specs:

PIII Katmai 450@526, fsb 117
524 mb RAM
Creative Ge force4 Ti 4200 64 mb ddr not o'clocked, 40.72 drivers
SbLive Player
2 Quantum HD
Other stuff
WinXP Pro, dx 9

As you may notice, I overclocked a little my sustem. The point is the only game which freezes with overclocking is just FIFA.
No other game freezes, neither apps nor windows, just FIFA.
FIFA freezes after about 20 mins of playing (1st half): everything gets stuck, I have to reset.

If I run the system @450, fsb 100, everything is ok.

I kindly ask your opinion on the matter.

Thanks in advance.