R715 not Optimal Memory Configuration

Hello

We have a bunch (35 ish) R715s all configured exactly the same. Each with two CPUs of AMD and the factory had modules memory 8 x 2 GB (1Rx8 PC3L-10600E-09-10-D0) inside.

Recently, I wanted to test the addition of extra ram. So, I bought 8 x 4 GB ram (2Rx4 PC3-10600R-9-10-E1). It is based on manuals Dells and determinative webpage about what would accept this server. When you try to install the ram here are the scenarios and what happens:

(1) add 8 new modules for the empty slots of 'Black '. The machine does not start just buzzing.

(2) take the 8 old modules out of the 'White' slots and REPLACE them with 8 new modules. It starts, but says "WARNING: the installed memory configuration is not optimal.  However, the bios reads 32 GB of ram.

(3) take it down to only 4 modules (new modules). Set as described in 'A1, B1, A2, B2' slot machines. Same message "not optimal" appears and reads the 16 GB of ram.

I also made sure that I am under the latest firmware available. Can you please explain what I'm doing wrong and my best option for ram I have?

Linxxs,

Sorry you are having memory problems with the server. The first question that you see, which once try to mix modules DIMM, is that new modules DIMM was purchased are Rdimms. The original DIMM, you have on the server are UDIMM, which Rdimms and UDIMM cannot be mixed in the same system. That's why you see the post No..

Now, when you install only the 4 GB Rdimms, the reason for the error "Not optimal" is that with the R715 with dual rank Rdimms, best would be 1333 mhz DIMM, where the rdimms 4 GB you ordered are at 1066 mhz. Now, these bars will work in the server, but is not optimal, where the error.

Just a note side when examining options, with unique access, you are limited to only 2 GB DIMMS, in order to extend it to allow only allows you to add several DIMMs of 2 GB. With double access, you can run as is, but will be the error, or you can swap in DIMM 1333 mhz modules.

Just a few things to consider.

Let me know if it helps.

Tags: Dell Servers

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