I have a 970 4gb (clocks to about 1400mhz in my case.) And an i5 4460s which automatically turbo clocks to 3.1 or 3.2 ghz. Mmy budget is 4-5 hundred dollars including a new motherboard and copy of windows 10 for the cpu if i go with that, and a new power supply if i need one (have a 600w) i like the 1070, but im afraid my current cpu would drastically bottleneck it.