R640 memory config

[Roelf Zomerman]

Hi everyone,

I'm trying to get the memory in my R640 to be as high as possible, but keep getting an "Mixed DIMMS's" error

I have
16x16GB - 2133 == 16GB 2Rx4 PC4-2133P-RA0-10-DC0
6 x 32GB - 2133 == 32GB 4DRx4 PC4-2133P-LD0-10-DC0
2 x 32GB - 2666 == 32GB 2Rx4 PC4-2666V-RB2-12

I tried to put in the 32GB (2133 + 2666) but that gave the error - so I guess the 2666 goes out the window

then I tried to populate
A1, A2, A3 and B1, B2, B3 slots with 32GB/2133
A4/5/6/7/8/9/10/11 and B4/5/6/7/8/9/10/11 with 16GB/2133

but it did not like that either..

any ideas on what should work?

according to the manual

• All DIMMs must be DDR4.
• RDIMMs and LRDIMMs must not be mixed.
• NVDIMMs and LRDIMMs must not be mixed.
• NVDIMMs and RDIMMs can be mixed.
• 64 GB LRDIMMs that are DDP (Dual Die Package) LRDIMMs must not be mixed with 128 GB LRDIMMs that are TSV (Through Silicon Via/3DS) LRDIMMs.
• x4 and x8 DRAM based memory modules can be mixed.
• Up to two RDIMMs can be populated per channel regardless of rank count.
• Up to two LRDIMMs can be populated per channel regardless of rank count.
• A maximum of two different ranked DIMMs can be populated in a channel regardless of rank count.
• If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s).
• Populate memory module sockets only if a processor is installed.
  • For single-processor systems, sockets A1 to A12 are available.
  • For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available.
• Populate all the sockets with white release tabs first, followed by the black release tabs.
• When mixing memory modules with different capacities, populate the sockets with memory modules with the highest capacity first.
  NOTE:For example, if you want to mix 8 GB and 16 GB memory modules, populate 16 GB memory modules in the sockets with white release tabs and 8 GB memory modules in the sockets with black release tabs.
• Memory modules of different capacities can be mixed provided other memory population rules are followed.

NOTE:For example, 8 GB and 16 GB memory modules can be mixed.

• In a dual-processor configuration, the memory configuration for each processor must be identical.
  NOTE:For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
• Mixing of more than two memory module capacities in one system is not supported.
• Unbalanced memory configurations will result in a performance loss so always populate memory channels identically with identical DIMMs for best performance.
• Populate six identical memory modules per processor (one DIMM per channel) at a time to maximize performance.

 

[Roelf Zomerman]

solved.. seems you cannot mix

2Rx4 PC4-2133P-RA0-10-DC0
4DRx4 PC4-2133P-LD0-10-DC0