Configuring and using DDR3 memory with HP ProLiant Gen8 Servers

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Figure 14. A memory configuration that is unbalanced across processors.
BIOS Settings for memory
The HP server BIOS provides control over several memory configuration settings for ProLiant Gen8 servers. You can
access and change these settings using the ROM Based Setup Utility (RBSU), which is part of all HP ProLiant servers. To
launch RBSU, press the F9 key during the server boot sequence.
Controlling Memory Speed
Setting Maximum Memory Bus Frequency
Using RBSU, you can set the speed at which the system memory runs to a specific value. This function is available from
the Power Management Options menu inside RBSU. With Gen8 servers, memory bus speed can be set to any of the
following:
• Automatic (speed determined according to normal population rules)
• 1333 MHz (MT/s)
• 1066 MHz (MT/s)
• 800 MHz (MT/s)
Setting the memory speed to a lower value (1066 MHz or 800MHz, for example) lowers power consumption. However, it
will also lower the performance of the memory system.