10-04-2017 12:43 PM - edited 03-01-2019 01:19 PM
Customer has installed 96 dimm's in a C460-M4 (SAP Hana Node)
UCS-MR-1X322RU-G 32 GB DDR4-2133/2400 Mhz RDIMM/2R/x4/1.2v memory dimm's
However, even with all the tricks in the service profile, the operational speed of the memory is only 1333 Mhz.
According to the specification https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/c460m4_specsheet.pdf
Table 10, the 32G RDIMM 2R with 3 DPC shows 1333 Mhz.
Can someone confirm, that this is max clock rate we can achieve with this configuration ?
10-06-2017 10:53 AM
Hi -
Based on the documentation and experience with other UCS servers, I agree with your assessment. The system will detect the module capacity, rank (dual / quad), and quantity per channel and step the speed accordingly.
Based on the documentation, the only way to get higher memory speed (1600/1866) on this platform would be to change the quantity per channel, swap to quad-rank, or enable "lock-step"(lock-step is likely undesireable considering your question).
PSC
10-06-2017 11:17 AM - edited 10-06-2017 11:30 AM
Thanks Paul
Based on the documentation, the only way to get higher memory speed (1600/1866) on this platform would be to change the quantity per channel, swap to quad-rank, or enable "lock-step"(lock-step is likely undesireable considering your question).
- DPC cannot be changed, otherwise the total memory size is reduced
- lock-step: according to the documentation: https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/c/sw/gui/config/guide/1-4-1/b_Cisco_UCS_C-Series_GUI_Configuration_Guide_141/b_Cisco_UCS_C-Series_GUI_Configuration_Guide_141_appendix_010000.html
-therefore the only solution would be swapping the memory Dimm's from dual to quad rank !
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