It looks like they have 7 cards in there.
If all the GPU's in that system where pegged at 100% for 30 minutes that system would overheat.
There isn't enough space between the cards for free air flow.
7 x 5970's would give you just under 35 Teraflops instead of 12.
7 x 5970's would give you just under 35 Teraflops instead of 12.