Hi, I need a bit of advice. I am struggling to choose between these two cards..... BFG GeForce 5500 OC 256MB PCI £90 and PNY VERTO GEFORCE FX5500 128MB DDR PCI £45 Obviously the BFG is 256MB, but also twice the price. Will it really make a big difference? I am running a Pentium 4 2.93Mhz with 512mb ram. Any help would really be apprieciated!