Hi, I'm obiously new to upgrading my computer. I'm looking to upgrading my video card and I was wondering, whats the difference between ddr1,ddr2, etc..... Graphics cards? I have a Pci-express 16 slot, does it matter what the ddr is or as long as its the right slot, will it still work on my computer? The card I currently have is ddr1 and the one I'm looking to buy is ddr2, I was just wondering whats the difference and would there be any reason that it wouldn't work on my computer? Thanks