Couldn't tell ya, though I imagine they'll be a Japanese attachment to do it sooner or later. What I can tell you is that it takes 16 PS3's to create a PS3 Gravity Grid and simulate a collision of two black holes. The University of Massachusetts Dartmouth is using 16 "stock" PS3's running Linux after what they describe as a "very generous partial donation" by Sony. Long story short they've networked them together to work with each other to generate these crazy feats of physics.

The Project Overview explains the University''s decision to use PS3's was hardly a choice at all as "Overall, a single PS3 performs better than the highest-end desktops available and compares to as many as 25 nodes of an IBM Blue Gene supercomputer. Finally, its incredibly low cost makes it very attractive as a scientific computing node, that is part of a cluster. In fact, its highly plausible that the raw computing power per dollar that the PS3 offers, is significantly higher than anything else on the market today!"

Via: PS3 Fanboy