There's a good impression of what a 7990 or 7970 X2 could look like. 4Gamer published some nice shots of the FirePro W9000 dual-GPU card that was briefly shown at AMD's Fusion Developer Summit, you can view the pictures over here.
This upcoming workstation card features two Tahiti GPUs, it promises 4 teraflops of single-precision and 1 teraflop of double-precision floating point performance. The W9000 comes with 6GB GDDR5 memory, uses two 8-pin PCI Express power connectors and features a cooling solution with three 90mm fans.
