Hi, I'm considering getting a GeForce 9800 GTX +, and my motherboard only has a PCI express x4 slot. This card is x16. I know it should work. My question is how much will it slow down being in a x4, and would I run into any problems using this card in a x4 rather that a x16? Would it be better to get a Sapphire HD 3850 AGP card? Would it be more powerful and faster? I am looking for the very best, able to run Crysis.