Apple Xserve (Early 2008) - Manual (Page 34)

34 Chapter 2 Installing or Replacing Components
About Memory for the Xserve
You can use the following memory in the Xserve:
 800 MHz DDR2 ECC FB-DIMMs
 1 GB, 2 GB, or 4 GB in matching pairs (optimally, 4 or 8 identical DIMMs)
 Error-correcting code (ECC)
Important: Apple recommends that you use Apple-approved FB-DIMMS. Other FB-
DIMMs might degrade the performance of the Xserve. DIMMs from older Xserve
systems are not compatible with this Xserve.
Note: Before you purchase DIMMs other than those recommended by Apple, make
sure that the memory manufacturer conforms to the Joint Electron Device Engineering
Council (JEDEC) specification. Make sure that the DIMMs support the correct timing
modes and that the Serial Presence Detect (SPD) feature has been implemented in
accordance with the JEDEC specification. To check DIMM compatibility, see the
Macintosh Products Guide on Apple’s website at www.apple.com/guide. You can
purchase Apple-approved memory online from the Apple Store at
www.apple.com/store.