1. Installing Internal Optional Devices
Express5800/R120h-2M (2nd-Gen) User’s Guide
79
Chapter 2 Preparations
Checking DIMM
To check out the features of the DIMM, please refer to the label affixed to the DIMM, the following illustrations
and tables.
Number
Description
Meaning
1 Capacity
8GB
16GB
32GB
64GB
128GB
2 Rank
1R = Single rank
2R = Dual rank
4R = Quad rank
8R = Octal rank
3 DRAM
data
width
X4 = 4 bit
X8 = 8 bit
X16 = 16 bit
4 Memory
generation
DDR4
5
The maximum speed of the
memory
2133 MT/s
2400 MT/s
2666 MT/s
2933 MT/s
6 CAS
latency
P = CAS 15-15-15
T = CAS 17-17-17
U = CAS 20-18-18
V = CAS 19-19-19 (for RDIMM, LRDIMM)
V = CAS 22-19-19 (for 3DS TSVLRDIMM)
7 DIMM
type
R = RDIMM (with register)
L = LRDIMM (low loading)
E = Unbuffered ECC (UDIMM)