My 1366 i7-920 system. The computer is about 2 years old, but I just added 2 6950 cards to the system and added them to the water loop. Everything is running on one 3x120 radiator, so no overclocking for now (was a solid 4ghz). Temps while gaming are great, 30 on the cpu and 45 on the gpu's...
http://www.supermicro.com/products/accessories/addon/AOC-SASLP-MV8.cfm
You'll need two sas to 4x sata cables to go along with it. They're about $20 each
The Silverstone LC-17 is 16.8" square. I have one, very quiet, lots of room.
..and it will fit long video cards with the middle hard drive cage removed.
that's pretty high. Are you able to monitor water temprature? My 920 idles 40deg on the hottest core, water temp is 26, ambient 22. That's stock speed.
Overclocked load is 57, 4.2ghz, 1.4Vcore.
That's with Realtemp.
Thermal paste evenly spread on the cpu?