New Cray Supercomputer Utilizes up to 30,000 Dual-core Opterons
 

Supercomputer company Cray announced the availability of its first product in Cray's Rainier program, the Cray XT4, previously code-named "Hood," equipped with AMD Opteron dual-core processors.

According to the press release, the XT4 designed to easily and efficiently scale to a peak performance of more than one petaflops (1,000 trillion floating-point operations per second). Evolved from the Cray XT3 supercomputer, the Cray XT infrastructure provides a common, scalable environment for login, compilation, resource management, work scheduling and I/O. This environment also includes a unique globally shared, high-performance parallel file system, as well as network interfaces to other systems.

that's the equivalent of 20.000 Core 2 Duo, or 10.000 Core 2 Quad's! ;)