a gig of ram and at least a 6600gt video card. mine runs oblivion at 1024x768 with 2x AA with very little lag. gfx arent perfect, but its the best gfx to FPS ratio Ive found. It also runs nfs: most wanted with everything on and at 1024x768 with little/no lag in FPS.
seing as how your FSB is 133mhz, this also means you need pc133 ram. Im not 100% sure on this so if anyone alse cna verify that please do so.
dont forget to check how much ram you can run. you dont want to buy 2 gigs and turns out it can only handle 1.
if you want cheap/reliable ram get some gigaram. I put my trust into gigaram http://www.newegg.com/Product/Produc...82E16820221041
or for some ram w/ a heatspreader http://www.newegg.com/Product/Produc...82E16820221042