hi guys looking for some info on a ati 512MB Sapphire RX1950Pro, PCI-E(x16), Mem 1400MHz, GDDR3, GPU 580MHz, 36Pipes CrossFire Master/Slave graphics card looking to buy one and wondering if its a ok card i'll also be upgrading my psu to 700w and the ram to 2gb will be play cod4,crisys,moh...