DIMM identification

To determine DIMM characteristics, see the label attached to the DIMM. The information in this section helps you to use the label to locate specific information about the DIMM.

DIMM characteristics
Item Description Definition
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

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)

7 DIMM type

R = RDIMM (registered)

L = LRDIMM (load reduced)

E = UDIMM (unbuffered ECC)