Here's what I did with my Switch 810...........
I've been working on another NZXT Switch 810 build as my first was so successful. This build consists of Asus Z68 Chipset with pci-e 3 support, Sandisk Extreme 256gb SSD and 2x2tb Samsung HDD's, Ivybridge 3770K, a pair of EVGA GTX 670 FTW's.
Watercooling loop is based on Swiftech Edge HD 220 kit with additional Magicool 140mm rad, Apogee HD on the cpu and EK full length GTX 680 waterblocks on the EVGA GTX 670 FTW's with the EK parallel Bridge joining the two vga cards. Been pretty impressed with the Parallel EK bridge for two vga cards. It creates an extremely firm array that is secure and does not place any stress on either of the vga pcb's. Currently I have 2 x Scythe GT 1850 rpm fans at 7v on the dual rad and a Bitfenix Spectre Pro 140mm fan 1200rpm on the Magicool rad and the Swiftech MCP is running at around 2100rpm's. I am still looking for the ultimate performance fans specifically for low noise radiator use.
Blown away that I have been able to run a pair of EVGA GTX 670's with +115mhz on the core and +600 on the memory together with Ivybridge at 4.4ghz with a single dual rad and an extra 140mm rad with low noise fans. This pushes the core of the FTW's to well over 1300mhz totally stable. I can confirm that the EK GTX 680 waterblock and back plate fit perfectly and work extremely well with the GTX 670 FTW. Nice work EK and Swiftech, the Edge HD kit has simplified the traditional WC loop no end, look how clean this build is.
Ivybridge is currently sitting at 4.4ghz and GTX 670's are +115mhz on the core and +600mhz on the memory.
My aim was low noise and not out and out performance. And as such if I overclock the ivybridge any more than 4.4ghz it begins to dump too much heat in to the loop. For the serious overclockers, a quad rad or 2 x 220's would be the minimum recommended for higher overclocks than 4.4ghz with Ivybridge.
Currently with 1.15vcore the 3770K peaks at 68C during Intel Burn Test and the GTX 670's peak at around 55C during looped runs with Unigine Heaven.
For those of you that think 1500W power supply is overkill, you will be totally correct, according to my Killawatt I am pulling around 728W from the socket during Unigine heaven when heavily overclocked and approximately 605W when running at stock. Ivybridge is extremely well behaved when run with stock vcore as are the pair of Kepler based GTX 670's. A 750 w power supply would have been ideal. I am using this one as it was a give away and makes for a nice clean interior to my case.
Quick run 3D Mark 11 Performance:
3D Mark 11 Extreme: