And like a million other places this question is asked, everyone spews opinion instead of a straight answer to the actual question. There are plenty of reasons to use readyboost even with >2GB ram. It's also not always feasible/affordable to get an SSD that is large enough to house the entire boot image w/ apps, games included. Manual separation between SSD and HDD is not very granular and extremely labor intensive and tedious to keep accurately maintained. Readyboost/superfetch already do this automatically (keep counts and patterns on file access), so the idea is to utilize that and get the best of both worlds from SSD and Readyboost. Get it now?