You have a Cisco UCS B200 M2 server configured with 12 4-GB DDR3 1333-MHz dual-voltage
memory DIMMs. You learned that the server memory speed is running at 1066 MHz instead. How
can you configure the server to run at maximum memory speed?
A.
You cannot configure memory speed of 1333 MHz. The maximum memory speed of a Cisco
UCS B200 M2 server with 12 4-GB DIMM is 1066 MHz.
B.
Memory speed of the ESX host is configurable on VMware vCenter.
C.
Create a BIOS policy. In the RAS Memory BIOS settings, select Performance Mode for LV
DDR Mode.
D.
On the CIMC of the Cisco UCS B200 M2, select 1333 MHz in the Memory Speed option.
The below show a good set of details for setting RAS Memory settings for different applications etc
http://www.cisco.com/c/en/us/products/collateral/servers-unified-computing/ucs-b-series-blade-servers/whitepaper_c11-727827.html
Memory RAS config in Cisco UCS within Bios policy settings
How the memory reliability, availability, and serviceability (RAS) is configured for the server. This can be one of the following:
• maximum performance—System performance is optimized.
• mirroring—System reliability is optimized by using half the system memory as backup.
• lockstep—If the DIMM pairs in the server have an identical type, size, and organization and are populated across the SMI channels, you can enable lockstep mode to minimize memory access latency and provide better performance. Lockstep is enabled by default for B440 servers.
• sparing—System reliability is enhanced with a degree of memory redundancy while making more memory available to the operating system than mirroring.
• Platform Default—The BIOS uses the value for this attribute contained in the BIOS defaults for the server type and vendor.
see
http://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/sw/gui/config/guide/2-0/b_UCSM_GUI_Configuration_Guide_2_0/b_UCSM_GUI_Configuration_Guide_2_0_chapter_011100.html#reference_08F63A1A00F1470387C604B11CA9A5BF