It can't hurt anything to try some DDR RAM that you have laying around. It may work just fine, but remember the G5 was pickier than just about any Mac when it comes to RAM. And ya, if its only got 1Gb of RAM in it now, try and get him to knock the price down at least $30. I really don't think I personally would go for any less than a quad G5 since even those can be had for as little as $750 these days.