Some initial 3D Mark Benchmarking with the XFX 6600 GTs in SLI scored 17366 marks in 03 and 7671 marks in 05. Both cards are simply air-cooled.

 XFX 6600GTs break 17K 3D Mark 03 & 7.6K 3D Mark 05

 XFX 6600GTs break 17K 3D Mark 03 & 7.6K 3D Mark 05

The 2 XFX 6600 GTs:

 XFX 6600GTs break 17K 3D Mark 03 & 7.6K 3D Mark 05

The Custom air-cooling used:

 XFX 6600GTs break 17K 3D Mark 03 & 7.6K 3D Mark 05