If it were me, I'd definitely upgrade the PSU. I got one of these as a hand-me-down and was shocked to find out it comes with a 300watt PSU. To be honest, can't say I did more research than checking newegg.com's power supply calculator which put the current setup of the PC, with on-board graphics selected, at around 320watts. Sure, might work with 9600GT, although, might have a periodic error. I'd say, lookup power supply calculators, and get a good graphics card.