4GPU in a 4u rackmount case.
I colo in a datacenter with unmetered power :p
Damn, you probably get air conditioning as well? How hot do they run?
[root@ ~]# aticonfig --odgt --adapter=all
Adapter 0 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 81.00 C
Adapter 1 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 79.00 C
Adapter 2 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 89.00 C
Adapter 3 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 87.50 C
Adapter 4 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 88.00 C
Adapter 5 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 85.50 C
Adapter 6 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 80.50 C
Adapter 7 - ATI Radeon HD 5900 Series
Sensor 0: Temperature - 78.00 C
That's too hot for my liking.