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Intel® Server System M50CYP2UR Family System Integration and Service Guide
Appendix C. General Memory Population Rules
In the Intel® Server System M50CYP2UR family, a total of 32 DIMM slots are provided – two processors, eight
memory channels per processor, and two DIMMs per channel. The following figure identifies DIMM slots on
the server board.
Note: All black DIMM slots must be populated with either DIMMs or supplied DIMM blanks. All system
configurations ship from Intel with DIMM blanks pre-installed. Pre-installed DIMM blanks should only be
removed when installing a memory module in its place.
Figure 164. Intel® Server System M50CYP2UR Family Memory Slot Layout
C.1
DDR4 DIMM Population Rules
Note: Although mixed DDR4 DRAM DIMM configurations are supported, Intel only performs platform
validation on systems that are configured with identical DIMMs installed.
The following memory population rules apply when installing DDR4 DIMMs:
•
Mixing rules:
o Mixing DDR4 DIMMs of different frequencies and latencies is not supported within or across
processors. If a mixed configuration is encountered, the BIOS attempts to operate at the highest
common frequency and the lowest latency possible.
o x4 and x8 DDR4 DIMMs may be mixed in the same channel.
o Mixing of DDR4 DIMM types (RDIMM, LRDIMM, 3DS-RDIMM, 3DS-LRDIMM) within or across
processors is not supported. This condition is a Fatal Error Halt in Memory Initialization.
•
For a single DDR4 DIMM in a dual-slot channel, populate slot 1 (blue slot).
•
For multiple DDR4 DIMMs per channel:
o When populating a quad-rank DDR4 DIMM with a single- or dual-rank DDR4 DIMM in the same
channel, the quad-rank DDR4 DIMM must be populated farthest from the processor. Incorrect
DDR4 DIMM placement results in an MRC error code. A maximum of 8 logical ranks can be used
on any one channel, as well as a maximum of 10 physical ranks loaded on a channel.
o For RDIMM, LRDIMM, 3DS-RDIMM, and 3DS-LRDIMM, always populate DIMMs with higher
electrical loading in slot 1 (blue slot) followed by slot 2 (black slot).
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