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I wish I could. Any overclock .even to 4ghz gives me a blue screen. Not sure whether my mobo is awful or my cpu is literally the worst of the worst.Based on the things you want I would buy the gpu and overclock the poo out of your cpu
Pick up a used 4790k,
wait till summer on the cpu change over if you upgrading doesnt matter about the gpu. as you will upgrade anyway. will be miles better than what you have now. while you wait.
no point getting 2600 now.
I'd consider a Vega 56 instead of the 2060 if you plan to tweak it. To quote Gibbo:
You should be able to get 4.2Ghz absolute minimum out of the 4670k with that mobo and decent air cooling, 4.4hz for something like 95% of chips.
There is no minimum OC.. He could have poor cpu, mobo, ram or all 3.
I had an i3 6100 that did 4.5, then I got a new motherboard that should have been better but only get 4.2Ghz