Carmack confirmed what I've been saying forever on these forums and MikeB keeps disputing: the RSX is much slower than the Xbox 360's GPU. Carmack says it is a bit slower, but it is actually significantly slower.
This is not the first evidence of that. We've seen lots of cross platform games have fewer lighting effects, etc, on the PS3 version to reduce the number of necessary passes. And still the PS3 versions run slower.







