Good Gear Guide
In Pictures: The 10 most powerful supercomputers o...
No. 1: Titan
The appropriately named Titan is a Cray XK7 powerhouse, producing 17.59 petaflops of performance using 560,640 AMD Opteron processor cores and 261,632 Nvidia K20x accelerators. It operates at the Oak Ridge National Laboratory.
In Pictures: The 10 most powerful supercomputers on the planet