Memory Support And Installation - Supermicro X11DAC User Manual

2.4 Memory Support and Installation

Note: Check the Supermicro website for recommended memory modules. Exercise
extreme care when installing or removing DIMM modules to prevent any damage.
Memory Support
The motherboard supports up to 4TB of 3DS LRDIMM (3DS Load Reduced DIMM), LRDIMM,
NV-DIMM (Non-Volatile DIMM), and RDIMM (Registered DIMM), DDR4 (288-pin), ECC
2933*/2666/2400/2133 MHz memory in 16 slots (*Note below). The black DIMM slots are
reserved for future NV-DIMM support. Populating these DIMM modules with memory modules
of the same type and size will result in interleaved memory, which will improve memory
performance. This motherboard also supports up to 5TB memory with DCPMM modules
installed based on the DCPMM population table on "DCPMM Memory Population Tables for
2nd Gen Intel Xeon Scalable-SP Processors" on page 36.
Notes: 1. Support for 2933MHz memory is dependent on the CPU SKU. 2. 16Gb-based
memory modules are supported by 2nd Gen Intel Xeon Scalable-SP processors only.
Memory Installation Sequence
Memory modules for this motherboards 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. To maximize memory
capacity, please populate all DIMM slots on the motherboard, including all blue slots and
black slots.
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. 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.
3. 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.
31
Chapter 2: Installation