Viking C88781 128MB PC100 CL3 DIMM Memory, Compaq Part# 308878-001 Comparable to Compaq memory part 308878-001. (Not compatable with Compaq model 5220) Enables you to run multiple programs simultaneously Enables you to open files and programs faster Premiere components guarantee flawless operation, even under the harshest conditions Installation is easy with Viking's comprehensive install guide or toll free tech support.