HP ProLiant DL360e Configuring and using DDR3 memory with HP ProLiant Gen8 Ser - Page 6

Table 2: Comparison of UDIMMs, RDIMMS, and LRDIMMs for ProLiant Gen8 servers Feature UDIMM RDIMM LRDIMM DIMM Sizes Available 2 GB, 4 GB, 8 GB 4 GB, 8 GB, 16 GB 32 GB Low power version of DIMMs Yes Yes Yes available ECC Support Yes Yes Yes Advanced ECC support Yes Yes Yes Address parity No Yes Yes Memory Mirroring and Lock- Yes Yes Yes Step Mode support Relative Cost Lower Higher Highest Maximum capacity on a server with 16 DIMM slots 128 GB 256 GB 512 GB Maximum capacity on a server with 24 DIMM slots 128 GB 384 GB 768 GB HP SmartMemory HP ProLiant Gen8 servers introduce HP SmartMemory technology for DDR3 memory. HP SmartMemory enables memory authentication of installed DIMMs. This verifies whether they have passed HP's qualification and testing processes and determines if the memory has been optimized to run on HP ProLiant Gen8 servers. Use of HP SmartMemory DIMMs enables extended performance and manageability features for the 2P ProLiant Gen8 servers. HP SmartMemory support extended performance compared to third party memory for several DIMM types and configurations. Table 3 summarizes these performance extensions. Table 3: Extended performance for HP SmartMemory DDR3 DIMMs in 2P ProLiant Gen8 servers 1333 MT/s RDIMMs 1 or 2 DIMMs per channel 1333 @ 1.35V (SmartMemory) 1333 @ 1.5V (3rd Party) 3 DIMMs per channel 1066 @ 1.35V (SmartMemory) 1066 @ 1.5V (3rd Party) 1333 MT/s LRDIMMS 1333 @ 1.35V (SmartMemory) 1333 @ 1.5V (3rd Party) 1066 @ 1.35V (SmartMemory) 1066 @ 1.5V (3rd Party) 1333 MT/s UDIMMs 1333 MT/s (SmartMemory) 1066 MT/s (3rd Party) Not Supported HP Advanced Memory Error Detection Over the past 5 years, the average size of server memory configurations has increased by more than 500%. With these increased memory capacities, increases in memory errors are unavoidable. Fortunately, most memory errors are both transient and correctable. Modern memory subsystems can correct up to a 4 bit memory error in the 64 bits of data that are transferred in each memory cycle. HP Advanced Memory Error Detection technology introduces refinements to error detection technology. Instead of simply counting each correctable memory error, this new technology analyzes all correctable errors to determine which ones have a higher probability of leading to uncorrectable errors in the future. 6