HP ProLiant ML310e Gen8 Server - Manual (Page 45)

Hardware options installation 45
IMPORTANT: This server does not support mixing LRDIMMs, RDIMMs, or UDIMMs. Attempting
to mix any combination of these DIMMs can cause the server to halt during BIOS initialization.
The server supports single- and dual-rank UDIMMs operating at a speed of up to 1600 MHz. Depending on
the processor model and the number of DIMMs installed, the memory clock speed might be reduced to 1333
or 1066 MHz. The server supports a maximum system memory of 32 GB, using 2-GB, 4-GB, and 8-GB
UDIMMs.
HP SmartMemory
HP SmartMemory, introduced for Gen8 servers, authenticates and unlocks certain features available only on
HP Qualified memory and verifies whether installed memory has passed HP qualification and test processes.
Qualified memory is performance-tuned for HP ProLiant and BladeSystem servers and provides future
enhanced support through HP Active Health and manageability software.
Certain performance features are unique with HP SmartMemory. The industry supports UDIMM at 2 DIMMs
per channel at 1066 MT/s. HP SmartMemory supports 2 DIMMs per channel at 1333 MT/s, or 25% greater
bandwidth.
DIMM identification
To determine DIMM characteristics, use the label attached to the DIMM and the following illustration and
table.
Item Description Definition
1 Size —
2 Rank 1R = Single-rank
2R = Dual-rank
3R = Three-rank
4R = Quad-rank
3 Data width x4 = 4-bit
x8 = 8-bit