Well... It really depends on how that fan's controlled. Speedfan MIGHT offer you speed control over it. There might be options in the bios. There might be something similar to cool 'n quiet that you could disable...
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Urban De-Development
* Athlon X2 4200 | 2048M RAM | 160G HD | 7600GT
* C2D T5250 | 2048M RAM | 160G HD | Intel x3100
* G4 1.33GHz | 512M RAM | 40G HD | Radeon 9200
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