Should I get a 650w or a 750w PSU?

Edieknox

Commendable
Apr 5, 2016
19
0
1,510
Hi, I'd like to know if I should get a 650w (Cooler Master V650 80+ Gold) or a 750w (EVGA Nex750G) for this build, I'm planning on overclocking the CPU to around 4.2 - 4.4 Ghz and overclocking the Graphics card. This is my build.

Intel i5-4690K
Gigabyte Z97X SLI
GTX 1080 or a 1070
Kingston HyperX Fury 2x4 GB
Seagate Barracuda 1TB
Phanteks PH-TC14PE

So, should I get a 750w PSU or a 650w PSU would be fine?
Thanks in advice!