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.
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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