ShALLaX got a DreamX (Xbox with upgraded CPU running at 1.4Ghz instead of 733mhz in the normal Xbox) and he ran some tests under Gentoox (performed on fresh Gentoox Home 3.0c installation).

You can check out some benchmarks he made here. ShALLaX also wrote some 'first impressions' with some pictures: here.

If you want to help out ShALLaX for all his work on Gentoox, read here and here