IBM System x3850 X5 Implementation Guide

134 IBM eX5 Implementation Guide
Figure 4-14 x3690 X5 planar showing memory DIMM locations
One or two processors without the memory mezzanine
In this configuration, all of the system’s memory directly attaches to processor 1. If a second
processor is installed, it accesses main memory through processor 1, resulting in a
performance degradation to processor 2.
When the memory mezzanine is not installed, install the DIMMs in the order that is listed in
Table 4-8 on page 135. Only certain DIMM combinations result in Hemisphere Mode being
enabled. Hemisphere Mode improves memory performance, as described in 2.3.5,
“Hemisphere Mode” on page 26.
Tip: For performance reasons, install and populate the memory mezzanine if you install
the second processor.

IBM System x3850 X5 Specifications

General

Brand	IBM
Model	System x3850 X5
Category	Server
Language	English