I have an ASUS K8V-VM mobo since my old one died and i`m currently using on board gfx. I dont know how to tell which gfx cards are compatible, all I know is I need PCI-Express. Is there anything that I need to consider other than the interface?

Thanks in advance.

Nope, so long as the card is PCI-E x16 you're good to go

Thanks a lot :-)