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Enthusiast

C240 M3 DRAM Operating Speed

I have a UCS C240 M3S that is operating the memory at a lower speed than I think it should. It has dual E5-2660 v2 @ 2.20GHz CPU's, and is running BIOS version C240M3.3.0.3a.0. It is fully populated with 4GB DIMM's, and all though DIMM's show a channel speed of 1333 in the memory section of the server inventory. The memory operating speed shows 1066. I have another server (C220 M3) running the same BIOS version C220M3.3.0.3a.0 with dual E5-2670 0 @ 2.60GHz CPU's, and it fully populated with 8GB DIMM's that show a channel speed of 1333, but it shows an operating speed of 1333. What gives? I have stared at all the BIOS options around memory, but I can't see anything that would cause it to chose a slower operating speed.

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Cisco Employee

Re: C240 M3 DRAM Operating Speed

Have you referenced your configuration in the C240 M3 Spec Sheet:

https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/c240m3-sff-spe…

You mentioned that you had your memory fully populated (3DPC), and in this configuration 1333 DIMMs will operate at 1066. Check out Table #6.

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Cisco Employee

Re: C240 M3 DRAM Operating Speed

Have you referenced your configuration in the C240 M3 Spec Sheet:

https://www.cisco.com/c/dam/en/us/products/collateral/servers-unified-computing/ucs-c-series-rack-servers/c240m3-sff-spe…

You mentioned that you had your memory fully populated (3DPC), and in this configuration 1333 DIMMs will operate at 1066. Check out Table #6.

Enthusiast

Re: C240 M3 DRAM Operating Speed

Doh! That answers it. I didn't realize it would slow the memory down when all channels are populated. I should have RTFM'd. Thanks!

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