need to buy a PSU how many watts do i need for my build

[mrfredo18]

https://pcpartpicker.com/list/6c4txY going for a single gtx 1080 ti should i get 650 or 750 ?

 

[geofelt]

Your GTX1080ti will be perfectly happy with a 650w psu.
The Seasonic is a top quality unit.

That said,
I have no problem overprovisioning a PSU a bit. Say 20%.
It will allow for a stronger future graphics card upgrade.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.

 

[MeanMachine41]

The SeaSonic - PRIME Titanium 750W 80+ Titanium Certified Fully-Modular ATX Power Supply is perfect and will be OK for future expansion and Overclocking.
For the extra $20 it's worth the investment