Pics of my new triple 6990 caseless rig. It's been running with dual 6990's for about 3 weeks now, and I just added a 3rd 6990 yesterday. I also have 2 more Sapphire 6990's coming in soon, and will put those into my desktop rig, which I use everday.
MyOpenPC Stackable case (with rear vertical board removed)
Corsair AX1200 PSU
MSI 890FXA-GD70
(2) 2GB Corsair RAM
AMD Phenom X4 840 CPU
250 GB SATA HDD
(2) 120mm Fans (~72 CFM each)
(2) Diamond AMD Radeon HD 6990's
(1) Sapphire AMD Radeon HD 6990
Adapter 0 - AMD Radeon HD 6990
Sensor 0: Temperature - 76.00 C
Adapter 1 - AMD Radeon HD 6990
Sensor 0: Temperature - 80.00 C
Adapter 2 - AMD Radeon HD 6990
Sensor 0: Temperature - 75.50 C
Adapter 3 - AMD Radeon HD 6990
Sensor 0: Temperature - 72.50 C
Adapter 4 - AMD Radeon HD 6990
Sensor 0: Temperature - 69.50 C
Adapter 5 - AMD Radeon HD 6990
Sensor 0: Temperature - 74.50 C