How To Cool a GTX 670 Quad SLI?

[Inori]

Alright, so my friend has eagerly decided to QUAD sli a GTX 670, which is completely ridiculous i know. But he was wondering how he would go upon cooling such a monster, see below for full build and specifications, help is much appreciated.

Specifications:
CPU: Intel Core i7-3770K - Click Here
GPU: Gigabyte GeForce GTX 670 2GB x4 - Click Here
PSU: Cooler Master Silent Pro Gold 1200W - Click Here
RAM: G.SKILL Sniper Gaming Series 16GB 240-Pin DDR3 1866 - Click Here
MB: ASUS P8Z77 WS LGA 1155 Intel Z77 - Click Here
SSD: Kingston HyperX 3K 240G 240GB - Click Here
HDD: Western Digital Caviar Black 1TB 7200rpm - Click Here
Chassis: NZXT SWITCH 810 White - Click Here

 

[Transmaniacon]

You need to watercool them.