Item Description Example
1 Capacity
8 GB
16 GB
32 GB
64 GB
128 GB
2 Rank
1R = Single rank
2R = Dual rank
4R = Quad rank
8R = Octal rank
3 Data width on DRAM
x4 = 4-bit
x8 = 8-bit
x16 = 16-bit
4 Memory generation
PC4 = DDR4
5 Maximum memory speed
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 TSV LRDIMM)
Y = CAS 21-21-21 (for RDIMM, LRDIMM)
Y = CAS 24-21-21 (for 3DS TSV LRDIMM)
7 DIMM type
R = RDIMM (registered)
L = LRDIMM (load reduced)
E = Unbuffered ECC (UDIMM)
16 Component identification
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