It's important to keep in mind that if you get a monster card like a GTX 960, but have a crappy CPU, you're going to be in for a lot of trouble. The CPU won't be able to keep up with the GPU if this is the case, causing the GPU to run at a reduced rate, which in turn keeps you from getting the full power out of your card.
I've had this issue for a while where thanks to my CPU, my card would only use half of my VRAM. After I've upgraded it's using all 4 GBs and seems to run at much higher clock speeds.
Never cut down on your CPU, it's one of the worst things you can do.
Edited by Foldingchair, 03 June 2015 - 07:34 AM.