not too much, but some of them (particulary the Core series) gets complaints about stuttering (this is mainly just people's systems not being fully compatible ie cant handle to data transfer speeds), and even a small cache (4MB would probably do it for even the oldest sata supporting systems) would alleviate this problem... also, i believe OCZ is working on a firmware fix for this problem, but it will be a complex process, so it might be a while before they actually release it... either way, any of our systems would run a Core SSD without noticeable stutter