Yes, I know it sucks except the CPU. I'll work on that later. But right now I just need to know if everything will be ok if I buy that graphic card... If I would have any compatibility problems. My biggest concern is the DDR2 - DDR3 thing...
The 5770 doesnt provide any more performance than the gtX 260, it actually performs a bit worse than the 4870 which is very close to the 260. The only thing the 5770 offers is DX11 support.