7950&955 be 3.8ghz oc

will i have bottlenecking i have the 7770 now which is a good card i have no problems with it i just want more fps...i been hearing back n forth wit bottlecking some say yes some say no...thanks to all that help.. this will be the the 7950 im buying this friday http://www.msi.com/product/vga/R7950-Twin-Frozr-3GD5-OC.html

There will be no bottlenecking.