Thank you Andressergio very much for this useful information. Unfortunately I'm unable to get other revision for reasonable price.
Could you tell me what is your opinion on how worthwhile is this kind of upgrade, with respect to higher ingame performance? Or should I just wait and collect more money for something like X58 I7 DDR3? I'm asking because I've found that for example in Dirt2 I get 56-61fps when in some reviews of R5870 Lightning with newer systems people get 80fps using the same game settings. That is why I started to thinking what is wrong with my system:/