i think this is it:
I'm afraid it only seems like it supports PCI
2 ( 2 ) x PCI - full-length
as there is no support for AGP, unless you are talking about the intergrated one on the motheboard which is a AGP 2x - integrated chip.
That is the problem with buying computers from companies
You can get some cheap PCI cards though that'll let you play rather new games, though I wouldn't expect high quality graphics with them.
Hope this helps