Re: Gainward FX5900 question
64°C for 3D gaming is good. 64°C for 2D is rather hot, but not device threatening. GeForce FX GPU maximum operating temprature is 140°C.
That being said, you may want to reseat the heatsink if you put it on. An NVIDIA white paper claimed that every 10°C drop in junction temperature doubled the lifetime of the GPU.
I used to drive a Heisenberg, but whenever I'd glance at the speedometer, I'd get lost.