A little while ago I had a discussion about the performance of the 112MB memory upgrade vs the 256MB BigRamPlus in an A4000...
I have managed to throw together a few tables and charts including comparisons and extended my 112MB upgrade doc with a Performance Test section including other information and comparisons as well. This particular comparison starts on page 47 using an A3660+r6.
Please, have a look if you are interested.
The link is the same:
http://bit.ly/A4000_112MB_upgrade_supplmtry