650 or 750 watt psu for this build?

Zkioussis

Reputable
May 31, 2015
3
0
4,510
http://www.amazon.com/gp/product/B010HWDP48?psc=1&redirect=true&ref_=ox_sc_act_title_1&smid=ATVPDKIKX0DER

The two psu im looking at is the EVGA Supernova p2 650 and 750, t1 on the psu list on the forums here and both the same build quality other than watt


Build
http://pcpartpicker.com/p/Y34X6h

CPU: Intel i5 6600
CPU Cooler: evo 212
Board: msi z170a m7
Ram: G.Skill tridentz ddr4 3200 2x8gb
Storage:Seagate barracuda 7200 rpm hdd
GPU: MSI GTX 970
Case: Thermaltake Chaser Mk-I Atx Full tower

PC picker estimates my wattage at about 324

So the question is should i go for the 650 watt or 750, from what i can find about 50% usage is the efficiency sweetspot so that would be the 650 but not sure how much of a efficiency loss i would take from the 750 instead which would give me some more room to grow in the future without getting as close to maxing it out