Memory Interleaving; Independent Memory Subsystems - Sun Microsystems Sun Fire V445 Server Administration Manual

not touch the components or any metal parts. Always wear an antistatic grounding
strap when you handle the modules. For more information, refer to the Sun Fire
V445 Server Installation Guide and the Sun Fire V445 Server Service Manual.
For guidelines and complete instructions on how to install and identify DIMMs in a
CPU/Memory module, refer to the Sun Fire V445 Server Service Manual and the Sun
Fire V445 Server Installation Guide.

Memory Interleaving

You can maximize the system's memory bandwidth by taking advantage of its
memory interleaving capabilities. The Sun Fire V445 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 0 match the capacities used in a DIMM
group 1. For optimum performance, install identical DIMMs in all four slots in a
CPU/Memory module.

Independent Memory Subsystems

Each Sun Fire V445 server CPU/Memory module contains an independent memory
subsystem. Memory controller logic incorporated into the UltraSPARC IIIi CPU
allows each CPU to control its own memory subsystem.
The Sun Fire V445 server uses a shared memory architecture. During normal system
operations, the total system memory is shared by all CPUs in the system.
76 Sun Fire V445 Server Administration Guide • September 2007