Whats the best GPU cooler for the money? I am looking to boost the performance of my x800xl. Also, whats the difference between the various Zalmans (vf700, Fatality, etc)? With the current stock heatsink I am running about 38 idle and 55ish while gaming at 420/510 clock. Will an aftermarket cooler give me any noticable performance? I mounted a 120mm fan directly over my video card area and it gave me a huge boost in overclockability, dropping my ambient temperature. Off topic, but will my clocks stay if I have ati tool closed, or does it have to be running?