x-bit has a review of an ES chip up.

Short run-down:
PR Rating 2800+
Actual Clock @ 1.6 GHz, 8x200
128k L1, 1MB L2, 1152 total.

There are instances where the low core clock really inhibits performance, but in others... (notice UT2003) where it just §§§§ing stomps.

Heres the link: Click Here