need help choosing a psu

[Tocopowerz]

Help

i dont know what W PSU to get for my pc

Case 900D
Motherboard : Gigabyte Z87Z-OC (socket 1150)
RAM : 16Gb 2400MHz
CPU : Intel I7 4770K 3.5GHZ (socket 1150)
HDD : 2 x WD 1tb HDD
SSD : Samsung 840 EVO 250GB
GPU Palit nvidia GeForce GTX 770 OC 2GB (Will be running in SLI )

It will be completeley watercooled

XSPC D5 Phanton 270 reservoir pump combo
480mm Radiator bottom mounted
240mm fromt Radiator

all the radiators will have Noctua fans on
also
3 Noctua 120mm on top mounted
And a 140 mm rad on the Back extraction

if some one could tell me the right psu to get it would help loads
TY

 

[VincentP]

To run this at under 80 % of rated load for the power supply (including both GTX 770 cards) minimum supply required is 780W with rating of 65A on the combined +12V rails.
Recommend a good quality 850W power supply.
Have a look at the Seasonic X 850:
http://www.seasonicusa.com/NEW_X-series_KM3_650-750-850.htm