I recently made Win7 Pro 64 my DAW OS. I'm running Cubase 5 in both 32bit and 64bit versions and have installed Stylus RMX in 32bit and 64bit versions as well.

To my astonishment, I see that the 64bit Stylus, running in 64bit Cubase, uses more RAM than the 32bit Stylus running in 32bit Cubase. It's a little bit more at startup, then gets progressively more for each sample added.

I've checked with the exact same projects.

What's the explanation for this?