Computer memory (3)
'computer memory' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ram that I've seen before include "Computers need it to operate" , "Temporary computer memory, initially" , "Thrust" , "what comes after fish" , "barge" .)
(Other definitions for rom that I've seen before include "Gypsy man" , "Read-only memory" , "Computer memory to read only, in short" .)