Sun Microsystems Sun Fire V440 Parts Installation And Removal Manual page 99

Caution – DIMMs are made of electronic components that are extremely sensitive
to static electricity. Static electricity from your clothes or work environment can
destroy the DIMM. Do not remove a DIMM from its antistatic packaging until you
are ready to install it on the CPU/memory module. Handle the DIMM only by its
edges. Do not touch the components or any metal part. Always wear an antistatic
grounding strap when you handle the DIMM. For more information, see "How to
Avoid Electrostatic Discharge" on page 44.
Memory Interleaving
You can maximize the system's memory bandwidth by taking advantage of its
memory interleaving capabilities. The Sun Fire V440 server supports two-way
interleaving. In most cases, higher interleaving results in improved system
performance. However, actual performance results can vary depending on the
system application. Two-way interleaving occurs automatically in any DIMM bank
where the DIMM capacities in DIMM group 1 do not match the capacities used in
aDIMM group 2. For optimum performance, install identical DIMMs in all four slots
in a CPU/memory module.
Configuration Rules
DIMMs must be added in pairs within the same group of DIMM slots; adjacent
slots belong to the same DIMM group.
Each group used must have two identical DIMMs installed—that is, both DIMMs
must be from the same manufacturing vendor and must have the same capacity
(for example, two 512-Mbyte DIMMs or two 1-Gbyte DIMMs).
For maximum memory performance and to take full advantage of the Sun Fire
V440 server's memory interleaving features, use identical DIMMs in all four slots
of a CPU/memory module.
Note – If DIMMs of different densities and speeds are installed as a pair, both
DIMMs will operate at the lower density and slower speed.
Chapter 5 Servicing the Motherboard Components 87