So it is a computer with a rebadged GTX280 in it that they are charging out the nose for because it comes with a few pieces of specialized software to make use of CUDA.
And I'm almost positive that I read somewhere that the 9800GX2 outperformed the GTX280 in applications like this, though I think the 9800GX2 consumed more power. So in terms of performance per watt, the GTX280 was better, and power consumption actually is a concern for many in this market.
Rig1: System Specs.
Rig2: A8-5600K@4.4GHz / AsRock FM2A75 Pro4 / 8GB Corsair DDR3-1600 9-9-9-24 / HD7560D / Samsung DVD-Burner / 1.5TB WD Green + 3x3TB WD RED in RAID5
Rig3: Athlon X2 4200+ / M4A79 Deluxe / 4GB G.Skill Pi DDR2-800 4-4-4-12 / GT430 / Sony DVD-Burner / 500GB WD
Rig4: Phenom II x6 1605T @ 3.6GHz / Asus M5A99X Evo / 8GB PNY DDR3-1600 9-9-9 / GTX470 & GTX470 / Samsung DVD-Burner / 1.5TB Seagate