HP PROLIANT ML330 G6 - Manual (Page 16)

Component identification 16
The memory subsystem may be populated with either RDIMMs or UDIMMs, but mixing the two types is not
supported. 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
4R = Quad-rank
3 Data width x4 = 4-bit
x8 = 8-bit
4 Memory speed 10600 = 1333-MHz
8500 = 1067-MHz
5 DIMM type R = RDIMM (registered)
E = UDIMM (unbuffered with ECC)
For the latest supported memory information, see the QuickSpecs on the HP website
( http://www.hp.com ).