How difficult is it to overclock an ATI X800 XL (AGP interface)? Can I expect to bring it up to performance of the higher end models of the X800 family (XT/PE)? Do I need aftermarket heat sinks and fans to avoid overheating the core? Any help in this would be appreciated...
It's pretty easy to overclock it, but you can't get very far at all. I happen to have an X800 XL AGP, myself, and after installing a Zalman VF700 and the accompanying ramsinks, I could barely get any kind of overclock.
The reason is that the R430 core that X800 XLs use is optimized for low-cost, not high-quality, according to this wikipedia article:
I really am not that concerned about the noise. I just want to overclock my core GPU about 30-50 Mhz without frying it. Do I need aftermarket hardware to do so, or am I ok just loading the ATItools and going with that?
It's not the best overclocker, but with some sort of aftermarket cooling you could expect to get 30-50MHz more from the core. I've OC my X800XL 30MHz core and 15MHz on the mem with stock cooling. My full load temps are around 60-65C.