DaWheelo :
Will my CPU affect the performance of this GPU in anyway?
GPU: ATI Radeon HD 7870 XT 2GB DX11.1
CPU: AMD Athlon X4 860K 3.7GhZ FM2+
If there is any bottleneck, will overclocking my CPU fix this?
good gpu
cpu is low end, so yeah especially in gta5 is will be the limiting factor of your fps
overclocking will lessen the bottleneck, but not eliminate it