I recently got my brothers "old" Sapphire X800 XT PE (520/560 stock) since he got hold of a new graphics card (bastard converted to Nvidia...). Anyway, im having some issues with overclocking this monster of a card. I was under the impression that this card was the King of the last generation and could at least handle a little overclocking without problems.... but I simply cant even overclock either the memory or cpu more than 1mhz without having it lockup or cause serious graphical errors. Not that I dont mind the stock rates of 520/560, but just seems odd. Is there somekinda overclocking lock in the bios or something else im unaware off? Maybe I need to upgrade my power supply, its just 350w. And yes ive done a completely fresh install of windows and updated all drivers etc.