One CD Drive Much Faster?

P4P800-E: Two CD drives (actually one CD and one DVD)

Memorex 52x CD and MadDog DVD (slower, but not sure how much)

Funny thing is, though, that when iTunes rips a CD on the
Memorex, it only shows something like "8x" or "6x" whereas when
it rips from the MadDog it consistently shows 12-16x... i.e. much
faster.

Both are IDE drives, although I can't say which one is designated
as "Master".

"Master" vs "Slave"? Or maybe some sort of driver issue?
--
PeteCresswell