Hey, im planning on upgrading either my cpu or gpu, and I need to know what would give me a more noticeable increase in performance in gaming. The gpu I currently have is a gtx 760, and my cpu is an i5 - 4430 3ghz the cpu I'd upgrade to is an i7 - 4790k 4ghz, and the gpu I'd get is a gtx 970. So which one should I upgrade?
I don't really see a point in getting the GTX 970. Save up a bit more and get either the GTX 980 or the GTX 980 Ti. I also don't think your CPU is a big bottleneck. Upgrading to the 4790k would not be very beneficial, at least for gaming.
The CPU won't really matter depending on what you do with it. From performance perspective the GTX 970 would be the best, obviously. Assuming that you're gaming at 1080P you should be fine for a while but the 980 Ti wouldn't hurt either... They'll start dropping in price soon enough so it might be worth waiting. Same goes for the AMD side of the story, we know the 390X is just the old 290X with 8GB but the "Fury" might be something to look out for. If you want to upgrade now then get the GTX 970, excellent card and couldn't be happier (besides a Titan X of course ).