HP ProLiant G6 - Manual (Page 27)

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Customer choice with DDR-3
Memory Technology Comparison
RDIMMs
Greater capacity, ECC
w/advanced memory protection
UDIMMs
Smaller capacity, lower price
points, ECC
Capacities at launch 2GB, 4GB, 8GB 1GB, 2GB
Max. DIMMs/Channel 3 Dual Rank 2 Dual Rank
Advanced Memory
Protection
ECC support
Lower Cost
Ranks/DIMM support
1, 2, 4 1, 2
DRAM support x4, x8 x8
Maximum capacity 144GB max capacity
(18 slots, dual rank)
24GB max capacity
(12 slots)
Note: No Mixing of RDIMM and UDIMM