Current Specs:

CPU: Intel i7 920 Bloomfield(Overclocked to 3.2Ghz) Mobo: Asus Sabertooth X58 1366 Socket LGA RAM: 6GB OCZ DDR3 1600 (3x2GB) GPU: GTX 560

I do a lot of gaming and I've been looking at upgrading to play any new games on the best settings now. (I assume in the future I'll have to tone the graphics down a little)

My issue is this: I don't know if my system is bottle-necking at my GPU or my CPU. I could see either honestly. I can play Bioshock Infinite no problem on decent settings. However, when I play other less intensive games like 7 Days to Die I get stuttering and whatnot which feels more like it could be a CPU issue...not sure.

If I were to upgrade with a price limit of $400...what would I upgrade to?

Only Caveat is I want to stay with NVidia...I just like their driver support. Also, I don't mind upgrading one now and waiting a couple months for the other. I'm just not sure if it's worth it to get an Intel vs AMD CPU. Been a long time since I owned one and I know they are cheaper, just not sure if there are any issues with them.

Please give me guidance!