Apple Xserve (Early 2009) - Manual (Page 33)

33 Chapter 2 Installing or Replacing Components
Adding Memory
The Xserve has 12 memory slots. The systems come with at least 3 GB of memory on
three 1 GB DIMMs. To improve performance and capacity, you can install up to twelve
DIMMs.
You can use the following memory in the Xserve:
1066 MHz DDR3 ECC (Error Correcting Code) DIMMs Â
1 GB, 2 GB, or 4 GB DIMMs (optimally, 6 or 12 identical DIMMs for a dual-CPU Xserve Â
and 3 or 6 identical DIMMs for a single-CPU Xserve)
Important: Apple recommends that you use Apple-approved DIMMs. Other DIMMs
might degrade the performance of the Xserve. DIMMs from older Xserve systems are
not compatible with this Xserve. You can purchase Apple-approved memory online
from the Apple Store at www.apple.com/store.
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.