I have a 512mb video card, does that mean when running games, instead of taking out of my 1gig ram, memory is drawn from the 512?

Is there anyway to find out whether my video card is compatible/not compatible with my mobo?

more video memory means that it wont use your ram as much to store testures and i have never heard of motherboard incompatability other than not having the right slot for the card you want

http://en.wikipedia.org/wiki/Expansion_card#Expansion_slot_standards

this is the best link i can find to explain the different types, mostly your gonna focus on AGP or PCI-E x16 or x1 for video, they do make PCI cards but will be slower when compared to the earlier two with PCI-E being the newest and fastest so pretty much if your card has the same slot as your mobo your good to go

ok thanks

pretty much, with newer cards on older boards you might not reach the full potential for bandwidth but its not a huge deal