HP ProLiant BL420c HP ProLiant BL420c Gen8 Server Blade User Guide - Page 29

• Quad-rank PC3L-10600 (DDR3-1333) LRDIMMs, operating as dual-rank DIMMs, at up to 1333 MT/s Speed, voltage, and capacity DIMM type RDIMM RDIMM RDIMM RDIMM RDIMM LRDIMM UDIMM UDIMM UDIMM DIMM rank Single-rank Dual-rank Single-rank Dual-rank Dual-rank Quad-rank Single-rank Dual-rank Dual-rank DIMM capacity 4 GB 8 GB 8 GB 16 GB 16 GB 32 GB 2 GB 4 GB 8 GB Native speed (MT/s) 1600 1333 1600 1333 1600 1333 1333 1333 1333 Voltage STD LV STD LV STD LV LV LV LV Depending on the processor model, the number of DIMMs installed, and whether LRDIMMs, UDIMMs, or RDIMMs are installed, the memory clock speed can be reduced to 1333 or 1066 MT/s. Populated DIMM speed (MT/s) DIMM type RDIMM RDIMM RDIMM LRDIMM UDIMM DIMM rank Dual-rank (8 GB) Single-rank (8 GB) Dual-rank (16 GB) Quad-rank (32 GB) Dual-rank (8 GB) 1 DIMM per channel 1333 1600 1333 1333 1333 2 DIMMs per channel 1333 1600 1333 1333 1333* * UDIMM is supported at 2DPC at 1333 MT/s using HP SmartMemory only. Third-party memory supports up to 2DPC at 1066 MT/s. 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. HP SmartMemory 1.35V DDR3-1333 Registered memory is engineered to achieve the same performance level as 1.5V memory. For example, while the industry supports DDR3-1333 RDIMM at 1.5V, compared to 1.8V for DDR-2 DIMMs. DDR3 Low Voltage DIMMs operate at 1.35V. For HP ProLiant Gen8 servers, the majority of new DDR3 DIMMs are Low Voltage as HP SmartMemory enables the same performance as 1.5V. This equates to up to 20% less power at the DIMM level with no performance penalty. In addition, 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. Memory subsystem architecture The memory subsystem in this server blade is divided into channels. Each processor supports three channels, and each channel supports two DIMM slots, as shown in the following table. Hardware options installation 29