In an article, ActiveWin lists leaked specs of Microsoft’s upcoming Xbox 360. Among the list is an interesting tidbit:

Custom IBM PowerPC-based CPU
- 3 symmetrical cores at 3.2 GHz each
- 2 hardware threads per core
- 1 VMX-128 vector unit per core
- 1 MB L2 cache

Apple’s current top-of-the-line Power Mac G5 tops out at 2.7 GHz.

UPDATE: The specs have been confirmed:  MacRumors