1
DRAM DIMM rank classification label
A DIMM rank is a set of memory chips that the system accesses while writing or reading from the
memory. On a multi-rank DIMM, only one rank is accessible at a time.
To determine the rank classification of a DRAM DIMM, use the label attached to the DIMM, as shown
in
Figure 12 DRAM DIMM rank classification label
Table 12 DIMM rank classification label description
Callout
Description
Remarks
1
Capacity
Options include:
•
8GB
.
•
16GB
.
•
32GB
.
2
Number of ranks
Options include:
•
1R
— One rank (Single-Rank).
•
2R
—Two ranks (Dual-Rank). A 2R DIMM is equivalent
to two 1R DIMMs.
•
4R
—Four ranks (Quad-Rank). A 4R DIMM is
equivalent to two 2R DIMMs
•
8R
—Eight ranks (8-Rank). An 8R DIMM is equivalent
to two 4R DIMMs.
3
Data width
Options include:
•
×4
—4 bits.
•
×8
—8 bits.
4
DIMM generation
Only DDR4 is supported.
5
Data rate
Options include:
•
2666V
—2666 MHz.
•
2933Y
—2933 MHz.
•
3200AA
—3200 MHz.
6
DIMM type
Options include:
•
L
—LRDIMM.
•
R
—RDIMM.
