Cisco UCS B420 M4 Installation And Service Note page 30

Memory Performance
Figure 16: Logical Representation of Channels
Memory Performance
When configuring your server, consider the following:
• DIMMs within the blade can be of different speeds, but all DIMMs will run at the speed of the DIMM
• No mixing of DIMM type (LRDIMM, RDIMM, TSV-RDIMM) is allowed.
• Your selected CPU(s) can have some affect on performance. CPUs used must be of the same type.
• Mixing DIMM ranks and densities can lower performance.
• Unevenly populating DIMMs between CPUs can lower performance.
Cisco UCS B420 M4 Blade Server Installation and Service Note
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with the lowest speed.
Servicing the Blade Server