http://bugs.winehq.org/show_bug.cgi?id=21165
--- Comment #12 from Erich Hoover ehoover@mines.edu 2010-02-16 14:04:23 --- (In reply to comment #11)
... No idea why borderlands doesn't use multicore in wine :-/
It might be that Wine doesn't support SetThreadIdealProcessor yet. I've seen that show up in the log for a lot of games, though I cannot remember if Borderlands is one of them.