Quote from: thecryptokeeper on May 21, 2013, 09:15:24 AM

3.75Mh/s Litecoin miner:

Hardware

Six MSI R7950 Twin Frozr 3GD5/OC (overclocked and undervolted)
MSI Z77A-GD65 motherboard
LEPA G Series G1600-MA 1600W power supply
Intel Celeron G1620 Ivy Bridge
G.SKILL Sniper Series 8GB memory
Six powered riser cards
Custom case

Software

Windows 8
Catalyst 13.1
cgminer 3.01

Config file:
"intensity" : "20,20,20,20,20,20",
"gpu-fan" : "0-100,0-100,0-100,0-100,0-100,0-100",
"temp-cutoff" : "95,95,95,95,95,95",
"temp-overheat" : "85,85,85,85,85,85",
"temp-target" : "80,80,80,80,80,80",
"gpu-powertune" : "20,20,20,20,20,20",
"gpu-memclock" : "1400,1400,1400,1400,1400,1400",
"gpu-engine" : "1050,1050,1050,1050,1050,1050",
"gpu-vddc" : "1.087,1.087,1.087,1.087,1.087",
"thread-concurrency" : "22400,22400,22400,22400,22400,22400",
"lookup-gap" : "2",
"worksize" : "256",
"gpu-threads" : "1",
"expiry" : "120",
"queue" : "1",
"scrypt" : true

Woohaaa!!! That really really good setup!!
It's quite similar to what I have build but your vertical placement approach is FAR BETTER than mine, you can fit a lot more of cards, and natural cooling should be a lot better!!!

I was just planing to build two more rigs, and I think I will do what you did!
excellent idea!