I have the following configuration:


  • 6X4GB on bank #1 (A1, A2, A3, B1, B2, B3)

  • 6X2GB on bank#2 (A4, A5, A6, B4, B5, B6)

Visualization of DIMM slots

I have another 6x16GB memories that I want to add.

Would it better to put the 16 GB memories in the place of 2 GB memories or to add them in the bank #3?

According to the manual using all three banks will make memories run at 800 MHz.

Also which memory mode would be bettrer, ECC or Optimized?

Advanced ECC Mode This mode uses two MCHs and “ties” them together to emulate a 128-bit data bus DIMM. This is primarily used to achieve a Single Device Data Correction (SDDC) for DIMMs based on x8 DRAM technology. SDDC is supported with x4 based DIMMs in every memory mode. One MCH is completely un-utilized, and any memory installed in this channel will generate a warning message during POST.

Memory Optimized Mode In this mode, the MCHs run independently of each other; for example, one can be idle, one can be performing a write operation, and the other can be preparing for a read operation. Memory may be installed in one, two, or three channels. To fully realize the performance benefit of the memory optimized mode, all three channels per CPU should be populated. This implies that some ‘atypical’ memory configurations, such as 3GB, 6GB, or 12GB, will yield the best performance. This is the recommended mode unless specific RAS features are needed.

Do you have any suggestions?


There are several guidelines that you need to adhere specifically for your server.

The population method is based on Ranks, assuming you have single and dual ranked modules, and 16 GB Quad Ranks, the following will apply

You must install the 16 GB modules in the white levered slots:

1) 16 GB's Bank #1 (A1, A2, A3, B1, B2, B3)

2) 4 GB's Bank#2 (A4, A5, A6, B4, B5, B6)

3) 2 GB's Bank#3 (A4, A5, A6, B4, B5, B6)

But of course, I am sure of the first bank. The rest is my assumption from the manual. Please refer the manual, Page 129

For the complete manual Click here

Good luck.

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