HP ProLiant DL360e Configuring and using DDR3 memory with HP ProLiant Gen8 Ser - Page 23

latencies. The CPU2 treads operating on the smaller memory capacity of CPU2 may consume all available memory on CPU2 and request remote memory from CPU1. The longer latencies associated with the remote memory will result in reduced performance of those threads. In practice, this may result in non-uniform performance characteristics for program threads depending on which processor executes them. Figure 13: A memory configuration that is unbalanced across processors. BIOS Settings for memory The settings below in the ROM Based Setup Utility (RBSU) of HP ProLiant Gen8 server BIOS provide control over memory configuration. 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) is used to save power, but will incur some performance penalty. 23