Need to make sure my video card will be compatible?

I have a compaq presario sr5605f it has a pci x16 slot which is the type of video card im looking at. Is there anything besides the BUS type to make sure itll work. Like ddr2 memory and so on. Just let me know everything i need to know for video card to comp compatibility. Thanks.|||There are only 2 things you have to worry about. 1 is the slot type. Second is some video cards require power from the power supply, if this is the case, make sure your PS has a 6 pin connector for a video card. So DDR2 is fine. Oh and size shouldn't matter (I mean actual size of the video card) unless your looking at a huge video card.