According to MS, a while back, there were two problems with 98 and memory. Over 512MB the directory cache could get out of hand, that was easy to fix by adding a couple of entries to either win.ini or system.ini: I did that after going to 768MB and it had a noticeable effect on disk operations. Over 1.5GB there was a more serious problem, can't remember whether there was a solution or not. Both issues were fairly easy to find in the Knowledge Base.