DIMM label 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 label identification
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)

For more information about product features, specifications, options, configurations, and compatibility, see the HPE DDR4 SmartMemory QuickSpecs on the Hewlett Packard Enterprise website (https://www.hpe.com/support/DDR4SmartMemoryQS).