It's not even GPU today. RAM is pretty much the bottleneck for everything. CPUs have been so much faster than RAM for so long now that they have to keep doing

It's not even GPU today. RAM is pretty much the bottleneck for everything. CPUs have been so much faster than RAM for so long now that they have to keep doing more and more tricks just to keep utilization up at all. With gaming, it's always texture memory and transferring from RAM to the video card that's expensive.