I force enabled readyboost through registry tweak on my 4 GB ram laptop, on an 8 GB generic chinese $3 microsd memory card in laptop’s builtin card reader, that wasn’t accepted by windows for readyboost.
TBH, I didn’t expect that it’d make any difference but boy it does make hell of a difference.
Although I’ve read everywhere about readyboost being a gimmick, at least it saves power by reducing hard drive activity on laptops with traditional hard drives.
Update: Strangely, when I upgraded the readyboost from 4 gig to 8 Gig, hard drive activity came back although the performance boost is still there, guess windows tries to cache the full 8 GB because even at times where harddrive activity is at peak, all applications run and load without any delay. Hard drive usage goes down when laptop’s plugged out (superfetch algorithms at their duty).