Thanks for reply Rick, appreciate that. However, the situation has changed just a little bit as my sister asked me to build her a new PC, so I thought I might give her my current GPU (BFG GTX 285) and the one (ZOTAC GTX 650ti) she is gonna buy will goes to mine desktop. Should I do that?

ZOTAC card supports DX 11 and have higher core and memory clocks I guess. I also took a look on several tests and ZOTAC has slightly more FPS in games.