6 core is not very useful for gaming which I presume you are most interested in.
Few games can use more than 2-3 threads.
Here is my stock approach to that perennial question:
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To help clarify your CPU/GPU options, run these two tests:
a) Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.
b) Limit your cpu, either by reducing the OC, or, in windows power management, limit the maximum cpu% to something like 70%.
Go to control panel/power options/change plan settings/change advanced power settings/processor power management/maximum processor state/
This will simulate what a lack of cpu power will do.
Conversely what a 30% improvement in core speed might do.
You should also experiment with removing one core. You can do this in the windows msconfig boot advanced options option. set the number of processors to less than you have.
This will tell you how sensitive your games are to the benefits of many cores.
If your FPS drops significantly, it is an indicator that your cpu is the limiting factor, and a cpu upgrade is in order.
It is possible that both tests are positive, indicating that you have a well balanced system, and both cpu and gpu need to be upgraded to get better gaming FPS.
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On the graphics side, the GTX980ti is as good as it gets for gaming at less than 4k. It is decent at 4k but for shooters, you might want sli.
Pascal has questions. When and how strong and at what price? What is the amd response.
Best guess is 3Q 2016.
On the cpu side, a i5-6600K with a decent overclock will be as good as it gets. The extra hyperthreads of the i7 will go largely unused.
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