Search:

http://h10025.www1.hp.com/ewfrf/wc/setupCategory?lc=en&cc=ca&dlc=en&product=331118&lang=en&

Here you can do some reading about your machine...find manuals or contact support.

Some basic...

Well we use the Geforce cards alot...have no real problems

Nvidea chipset......

have had too many problems with the ATI drivers myself

you will need to know what slots you have available in...