Rather than having to buy new hardware and potentially a new motherboard to increase game performance I would have thought it would be better to get some decent cooling and overclock the card (as its meant to be overclocked)
Ignore the 500
mhz and 900
mhz (downloaded from a website). Actual reading on mine is 400 core clock speed, 1100 memory clock speed.
On full: Coreclock would potentially be 420hz and memory clock would be 1200mhz on full
Btw this software is bundled with the card.