Skip the 9500GS - see the HP forum site Desktop/hardware reference to this card. Close to a 100 posts with I see 5000 views on at least the first post. Reports of major problems and MULTIPLE fan replacements.
Search on this: Pavilion m9340f / GeForce 9500GS fan noise
Since you are asking this comparison and assuming HP machine - check into the Barracuda 7200.11 issue on Seagate drive!