Memory Installation Sequence; General Memory Population Requirements - Supermicro X12 Series User Manual

Supermicro Memory Configuration User Guide for the X12 Series Motherboards

3. Memory Installation Sequence

To maximize memory capacity, the rule of thumb is to populate all DIMM slots available on
the motherboard, including all blue slots and black slots. However, there are exceptions to
this general rule. Good examples of exceptions include the X12DPi-N(T)6 and X12DPT-B6
motherboards, for these motherboards do not require onboard DIMM slots to be populated
to the fullest capacity in order to achieve optimal memory performance.
Memory modules for the X12 Series motherboards (Note below) are populated using the "Fill
First" method. The blue memory slot of each channel is considered the "first DIMM module" of
the channel, and the black slot, the second module of the channel. When installing memory
modules, be sure to populate the blue memory slots first and then populate the black slots.
Using unbalanced memory topology such as populating two DIMMs in one channel while
populating one DIMM in another channel on the same motherboard will result in reduced
memory performance.
Note: The memory population information listed below is intended for Supermicro
X12UP/DP/MP motherboards, excluding the X12ST Series motherboards.

4. General Memory Population Requirements

1. Be sure to use the memory modules of the same type and speed on the motherboard.
Mixing of memory modules of different types and speeds is not allowed.
2. Populating memory slots with a pair of DIMM modules of the same type and size will
result in interleaved memory, which will improve memory performance.
DDR4 Memory Support for the 3rd Gen Intel Xeon Scalable
Processors
DDR4 Memory Support for the 3rd Gen Intel Xeon Scalable Processors
Ranks Per DIMM &
Type
Data Width
SRx8
SRx4
RDIMM
DRx8
DRx4
RDIMM 3Ds (4R/8R) X4
LRDIMM QRx4
LRDIMM - 3Ds (4R/8R) X4
Slots Per Channel (SPC) and DIMMs Per Channel (DPC)
DIMM Capacity (GB)
(1-DIMM Per Chan-
8Gb 16Gb
8GB 16GB
16GB 32GB
16GB 32GB
32GB 64GB
2H- 64 GB 2H- 128 GB
4H-128 GB 4H-256 GB
64GB 128GB
2H- 128 GB
4H-128 GB
4H-256 GB
4
Speed (MT/s); Voltage (V);
1DPC
2DPC
(2-DIMM Per Channel)
nel)
1.2 V 1.2 V
3200 3200
3200 3200
3200 3200