64MB is oddfor a IIci, it would have to be 4x16MB or 8 x 8mb 30 pin SIMMs, both of which are not that common. Unless you are running RAM doubler on 32MB (which is common 8 x 4MB 30 pin).

Which cache do you have? There is the common Apple 32K one, the hard to find Radius 64K one, and the super rare 128k one.

IIci's are nice systems, enjoy.