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Dell Precision 7920 Rack Owner's Manual

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Memory

DIMMs supported

The Precision 7920 Rack supports up to 24 DIMMs, with up to 1536GB of memory and speeds of up to 2666MT/s.

The Precision 7920 Rack supports registered (RDIMMs) and load reduced DIMMs (LRDIMMs) which use a buffer to reduce memory loading and provide greater density, allowing for the maximum platform memory capacity.

Table 1. Memory technologies supportedThe table below shows the supported memory technologies.
Feature Precision 7920 Rack (DDR4)
DIMM Type RDIMM
LRDIMM
Transfer Speed 2666 MT/s
2400 MT/s
2133 MT/s
Voltage 1.2V (DDR4)
NOTE:Unbuffered DIMMs (UDIMMs) are not supported in Precision 7920 Rack
The Precision 7920 Rack supports the following DIMMs.
Table 2. DIMMs supportedThe table below shows the supported memory for Precision Rack 7920
DIMM Capacity(GB) DIMM Speed DIMM Type Ranks per DIMM Data Width SDDC Support DIMM Voltage
8 2666MT/s RDIMM 1 x8 Advanced ECC 1.2
16 2666MT/s RDIMM 2 x8 Advanced ECC 1.2
32 2666MT/s RDIMM 2 x4 All Modes 1.2
64 2666MT/s LRDIMM 4 x4 All Modes 1.2

Memory Speed

The Precision 7920 Rack supports memory speeds of 2666 MT/s, 2400 MT/s, and 2133 MT/s depending on the DIMM types installed and the configuration. All memory on all processors and channels run at the same speed and voltage. By default, this speed will be the highest speed supported by the CPU and the DIMMs. The operating speed of the DIMMs is also determined by the maximum speed supported by the processor, speed settings in the BIOS and the operating voltage of the system. Not all processors support 2666MT/s memory speed.

The table below lists the memory configuration and performance details for the Precision 7920 Rack, based on the quantity and type of DIMMs per memory channel.

Table 3. DIMM Performance DetailsThe following table shows DIMM performance details for Precision Rack 7920
DIMM Type DIMM Ranking Capacity DIMM Rated Voltage, Speed 1 DPC 2 DPC
RDIMM 1R/2R 8GB, 16GB, 32GB DDR4 (1.2V)

i: 2666

D:2666

i: 2400

D:2666
LRDIM 4R 64GB DDR4 (1.2V)

i: 2666

D:2666

i: 2400

D:2666

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