You will be massively bottlenecked by your 2600k with a 1080ti.
I had an i7 3820 (basically 2600k on X79 platform) and it couldn't keep up with the 1080, huge performance dips in games like BF1.
+1 to CPU upgrade before dropping money on a new GPU.
DancinJack wrote:lol wow. if ryzen is real, that AMD marketing team needs to be fired. now. yesterday.