If you purchase an HP machine more than likely it has the cheapest motherboard they can get inside. Thats why you only have one other expansion slot thats x1. If your looking at newegg go look at some of the combo deals. I saw a 8800GT that comes with an MSI Intel motherboard. I think it was in the $400's. If you get a new motherboard thats high quality with a second 8800GT its just going to help you in the future. Dont by a PCIeX1 crappy video card.