if it runs stable it shouldn't be an issue, video cards run a lot hotter than CPU's, not sure on the geforce 3 cards but the FX 5900 cards temp threashold where it starts to downclock the GPU is 160C, most people report an average temp at load of 80-90C. and not that's not a typo, it is 160C not 160F.
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Athlon 64 3000+ Venice / Asus A8N-SLI Premium / 2X Corsair XMS 512mb PC3200
BFG 7800GTX / Audigy 2 / Dell FP2001 20.1" / Antec TruePower 2.0 TPII-550
WD Raptor 36.7GB / WD Raptor 74GB / Maxtor 120GB SATA
Water Cooled: CPU Swiftech Storm / GPU Maze 4 / Danger Den Double Heater core / Eheim 1250
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