I will either be buying a gtx 770 or the r9 280x. The r9 280x has 3gb of memory, and a memory bandwidth of 384 bits. The 770 has 4gb of memory, but a memory interface of 256 bits. The question is in the title. Which will be faster?
Quick note on ssddx's post: Even at 2560 x 1600 you will not be bottlenecked by VRAM so long as its more than 2GB, unless you decide to surround these monitors, at which point you will easily be bottlenecked by the GPU performance, not the VRAM amount.
out of the two, they both perform closely, but the 280X is the winner most of the time. yes, of course 3gb is more than enough. i was just backing up my claim about there being no real performance difference between 2gb and 4gb of vram