munchy22 :
im on the edge of the same upgrade, mainly due to broken usb headers and a dodgy on-board network driver on mobo. My 1070 runs all games on my i7 3770 with anything from mostly medium to high graphics at 100hz monitor, x34 predator. Some older games like bf4 its just overkill. To be honest i play gta 45 with nearly full graphics but a few settings down to maintain a 100 hz. My fps reads 60-70 when gpu oced. Still not sure the comparison of my monitor running at 100hz when the fps counter is 60-7, all i understand is even at 45-50 fps my monitor still feels like 100 hz. I know im being greedy as i want ultra settings, but even with a i8700 id need a 1080 ti gpu to do that. Still assassins creed runs with very high settings and only shadows low at 70fpr on 100 hz and i dont notice the dips. I tested my mates haswell i7 i forget its name but its the top one a k too and with my 1070 i did see a increase of anything around 10-30 fps depending on game, at the same time my gpu wasn't being bottlenecked on my i3770k. Im guessing the extra fps was due to the cpu, its improved architecture and its brute force.
@ms288 also.
My specs
4790K
GTX 1080 Ti
1600Mhz ram. (Actually 1866Mhz, but no XMP profile available on motherboard, so locked at 1600MHz.)
Monitor: Acer g-sync, 27 inch, 1440p, 144Hz.
(I still think of 60fps as minimum frame rate though, in most games. Some games like Crysis 3 are smooth well down to 30 fps, without v-sync.)
I am actually struggling with bottlenecking on my system, for a reason that I can not work out. Bit of a long story so be patient.
Originally I had a 1080p monitor and a GTX 980, 4790K, 1600MHz RAM.
At 1080p the only bottleneck I thought was really the GTX 980 (in some games) if I wanted max settings. If I used Nvidia DSR at 1440p, something else came into play to cause a bottleneck. I never could work out what it was. Sometimes frame rate dropped even when CPU and GPU were not maxed out.
When I got a 1440p monitor and GTX 1080 TI, I tried playing Rise of the Tomb Raider. There were times when clearly the GPU and CPU were not maxing out. However I was seeing frame rate drops down to about 45 fps sometimes. I never worked out what was causing that, but assumed it was slow system RAM.
I have other games that do this. The Evil Within Two. Ghost Recon: Wildlands.
I checked to make sure my CPU was not just maxing out on one thread, while playing these. It was not. .. (An example where one thread was maxing, is in Assassin's Creed: Black Flag, which also dips well under 60 fps.)
Anyway I bought a 8700K, and some 3000MHz RAM. However I have still not built that system yet. Just need to install OS on new system, and transfer files over, then up and running.
I'll let you know what the result is. If it cured my bottlenecking, that was not CPU or GPU related. However I am worried about games that utilise one core/thread more like Black Flag. Basically because single core performance of 8700K over 4790K, is only about 10%. Pretty poor performance improvement of single core, over four generations of CPU, if you ask me.