I run 12 GB or RAM. I haven't touched that ceiling yet. And I agree with Savage. USB is SLOW so I only see this as a bandaid. Maybe I'll cruise ovet to anandtech or tomshardware and see if they have talked about it yet. Okay, here is the anandtech article. It's talking about VISTA performance but the first portion deals with READYBOOST. http://www.anandtech.com/show/2163/6