is 620W enough for this system?

joaofsa2000pt

Commendable
May 29, 2016
14
0
1,520
CPU: i7 6700k (maybe oc in the future)
Cooler: Thermalright Macho Rev.B
MOBO: Asus Maximus VIII Hero
Memory: Gskill Aegis 2800mhz(2x8gb)
Gpu: Gigabyte GTX 1070 Xtreme
Storage: adata SP900(125gb), WD green(250gb), WD black(1tb)
Fans: 3x120mm, 1x90mm

this is a build im planning on purchasing in 2 parts(first gpu + psu then the rest,the storage is from my current rig).
so i see alot of people with 750W psu with a similiar build so i dont if a Seasonic M12II 620W evo will be enough. i really like this power supply with its price(88€) and i dont want to spend much more on a power supply so my only solution is to go for a higher Wattage power supply but with a bit lower quality.