Will Power Color 6790 bottle neck AMD Phenom II 955 BE?
I Don't think so but.
What do you mean by bottle neck? We need to know in what application/modality you are referring too. I can tell you that I built a machine with a HIS Radeon HD 6790 with a Phenom II x4 955 BE and didn't have any problem playing most games on max. I was able to play BF3 just under ultra, but I upgraded to my current system because a friend bought my computer. If you are looking to game, I would suggest you spend an extra $30 and get a 6850 well worth the minor amount of extra cash.