OK sorry my bad that was a misunderstanding on my behalf. Yep he has 533MHz. if it's PC-4200.If he got DDR2-533 it will be 533 data rate that is PC2-4200
If he got DDR2-1066 that would be 1066 data rate and that is PC2-8500
Don't expect the GT 240 to give you amazing results, it's not really a gaming card at all.