Originally Posted by Bit_reaper
I think you guys are been a bit to harsh on the P4. Remember that single core athlon I mentioned earlier. My brother played Crysis 1 with that and a 8800GTS. Now this P4 might not be as good but surely it will run some lighter/older games with a capable GPU. A 9600gt is under shooting it. The suggested 5770 is pretty much in the swat spot along wit some others 4850/70/90 or nvidia 8800gts, 9800gt, 250 or 260. Any of thees GPU can be had for peanuts. Whether or not he will be able to play an certain game will come down to what that games minimum CPU requirement is.
I sold a 9800GTX+ (GTS 250) to my friend who runs a 3.2 ghz P4 with HT. The CPU is bottlenecking the card HARD
That said, he plays at 1280 x 1024 and can still play some modern games which aren't too intensive like Dead Island for example. But even some Source Engine games are barely playable due to being CPU limited (Nuclear Dawn, Team Fortress 2, Alien Swarm). But yea that pretty much is his best option. He needs a complete system overhaul.
And OP, don't worry about Sins. I played that game on a 1.8 ghz AMD Sempron 3400+ with an 8600 GT on medium settings. The game scales incredibly well with hardware.