Is 850 watt psu enough.

[Shahzad_123]

I am building my pc with i7 6700k and zotac 980ti amp! Extreme, acer xb271hu,16gb ram.will only use for extreme gaming .Will 850 watt be more than enough. Or should I go for 750 watt
My full parts list http://pcpartpicker.com/p/tFdT8d

And please tell me if I overkilled it or not

 

[DSzymborski]

If you're not going SLI, you could make do with a 650 if you wanted. 750 or 850 will be just fine, though it's important to pick a good manufacturer.