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.
DIMMs supported
Table 19. Memory technologies supported
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 20. DIMMs supported
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 21. DIMM Performance Details
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
LCD panel
The LCD panel provides system information, status, and error messages to indicate if the system is functioning correctly or
requires attention. The LCD panel can also be used to configure or view the system’s iDRAC IP address. For information about
104 Technology and components
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