Well, I bought this card off of a friend, only because I wanted another X850XT PE, but didnt want to spend too much on another one... After having read these forums and learning of the X800GTO2 I went and looked for one and found one for a very decent price. First thing I did after taking it out of the box was remove the fan and heatsink, made sure it was an R480, and then added a stock cooler from my X850XT PE (that now has an Arctic Cooler) on to the X800GTO2. Then I unlocked it to 16 pipes using the bios also provided by this site, via bootable floppy with atiflash. So now I had Windows detecting it as x800/x850 on device manager and ATiTool reporting an R480 chip with 16 pipelines. I had ATiTool detect my highest core and memory settings. For core, it was 627MHz, for memory, it was 617MHz. So after it ran it's tests I figured I could simply set the core to 540MHz and memory to 590MHz to have the platinum I wanted. Well the memory took fine, but once I set core, my PC froze, went black, and then blue screen with something about a problem with ati2dvag (sorry I cant remember exactly what it stated) was shown. So when I rebooted, the core went back to it's 398MHz rating. So I did 10MHz at a time, while checking each time for artifacts for a couple of minutes. When I reach 497 the PC either freezes or gives me a blue screen again with the same message. So I though that maybe it needed a new bios so it couls be detected as an X850XT PE, So from this site I downloaded the bios for a sapphire x850xt pe (PCIe, 256MB) and flashed the card. I gets to the welcome screen on XP, but freezes there and restarts and keeps doing the same. I figured it was because the bios is now telling the card that its default speeds are 540 core and 590 memory (is this correct?). So my guess would be that the card cannot be clocked higher than 490, which is the last clock speed that it survives an artifact scan. Anyway, I flashed it back to the modded X800GTO2 with 16 pipes and have the core clock set at 480MHz and memory at 590MHz, but I am dissapointed. Since I replaced the heatsink and fan to that of an actual X850XT PE and have pretty good cooling in my case (Antec P160). I thought for sure it would do atleast as well as a regular X850XT, but it doesn't go higher than that of which I mentioned. Am I doing something wrong? Or am I SOL? Of course I am happy to have been able to OC it as far as I did, but after reading so much success with this card, I kinda feel let down... OK I'm gonna cry now.. while I do that if someone knows a way for me to remedy this problem of not being able to clock the core at X850XT PE speeds, i would higly appreciate your help. thank you all!