A Bad Day said:
When you increase resolution, the CPU usually isn't impacted; it will continue giving the same frames per second if the GPU was liquid nitrogen cooled and OC'ed insanely.
In many games, it's responsible for pathfinding and physics, which doesn't change regardless of resolution. However, GPUs' VRAM and memory bandwidth are affected the most by resolution.
If the memory bandwidth is one of the most effected with resolution change would i be better off to recommend say the 660 due to the fact that if he decides to upgrade to a 1080p monitor the low memory bandwidth oft he 650 ti might hinder his performance at that level. i just wasn't sure if the cpu would bottleneck the card to a point that this would not even become a factor.