398708-061 HP 4GB 2RX4 PC2-5300F-555-11 Memory Module
[398708-061]

5 of 5 Stars I have purchased these memory modules for a server so it is very unlikely they will work on all desktop and /or apple products. This is typically ECC memory for a server (even though in some cases can be installed on desktops - depending on many factors). I have an HP XW8400 Workstation, and this incredible bargain helped breathe new life into this old rig!. These are high density memory modules and I got them at the right price at the right time with no issues at all so far.