its the sdk i think not sure . dont know much about it as yet . and my motherboard has a ddr2 ram
its the sdk obviously. Forgot about the mobo. But u should still get atleast 4GB RAM .Is ur cpu Phenom II X4 940 or X2?
Also forgot about this: MSI N560GTX Ti Twin Frozr II Edit: 880MHz core clock
If u can find this card in ur budget then its the best one out there of the GTX 560 Ti's
Edit: Also important what is ur PSU?