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For additional safety best practices information, see the Regulatory Compliance Homepage at Your computer uses 1066 MHz and 1333Mhz DDR3 unbuffered or registered ECC SDRAM memory. DDR3 SDRAM, or double-datarate three synchronous dynamic random access memory, is a random access memory technology. It is a part of the SDRAM family of technologies, which is one of many DRAM (dynamic random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR2 SDRAM. The primary benefit of DDR3 SDRAM is its ability to run its I/O bus at four times the speed of the memory cells it contains, thus enabling faster bus speeds and higher peak throughputs than earlier technologies. This is achieved at the cost of higher latency. Also, the DDR3 standard allows for chip capacities of 512 megabit to 8 gigabit, effectively enabling memory modules of maximum 16 gigabyte in size. DDR3 memory comes with a promise of a power consumption reduction of 30% compared to current commercial DDR2 modules due to DDR3’s 1.5 V supply voltage. This supply voltage works well with the 90 nm fabrication technology used for most DDR3 chips. Some manufacturers further propose to use "dual-gate" transistors to reduce leakage of current. The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3’s 8 bit deep prefetch buffer, whereas DDR2’s is 4 bits, and DDR’s is 2 bits deep. Memory Modules Standard name Memory clock Cycle time I/O Bus clock Data transfers per second Module name Peak transfer rate DDR3-1066 133 MHz 7.5 ns 533 MHz 1066 Million PC3-8500 8533 MB/s DDR3-1333 166 MHz 6 ns 667 MHz 1333 Million PC3-10600 10667 MB/s Supported Memory Configurations Single Processor Memory Configurations Size (GB) DIMM Ranks DIMM1 DIMM2 DIMM3 DIMM4 DIMM5 DIMM6 3 SR 1 GB 1 GB 1 GB 4 SR 1 GB 1 GB 1 GB 1 GB 4 MR 2 GB 1 GB 1 GB 1 GB 6 SR 2 GB 2 GB 2 GB 8 MR 2 GB 2 GB 2 GB 1 GB 1 GB 12 SR 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 12 DR 4 GB 4 GB 4 GB 24 DR 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 24 DR 8 GB 8 GB 8 GB 32 MR 8 GB 8 GB 4 GB 4 GB 4 GB 4 GB 48 DR 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 96 QR 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB Dual Processor Memory Configurations Size (GB) DIMM Ranks MB DIMM1 MB DIMM2 MB DIMM3 MB DIMM4 MB DIMM5 MB DIMM6 Riser DIMM1 Riser DIMM2 Riser DIMM3 Riser DIMM4 Riser DIMM5 Riser DIMM6 3 SR 1 GB 1 GB 1 GB 4 SR 1 GB 1 GB 1 GB 1 GB 6 SR 1 GB 1 GB 1 GB 1 GB 1 GB 1 GB 8 MR 2 GB 1 GB 1 GB 2 GB 1 GB 1 GB 12 SR 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 24 DR 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 24 SR 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 48 DR 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 48 DR 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 96 DR 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 128 MR 16 GB 16 GB 8 GB 8 GB 8 GB 8 GB 16 GB 16 GB 8 GB 8 GB 8 GB 8 GB 192 QR (RHEL ONLY) 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB Dual Processor Memory Configurations Size (GB) DIMM Ranks MB DIMM1 MB DIMM2 MB DIMM3 MB DIMM4 MB DIMM5 MB DIMM6 Riser DIMM1 Riser DIMM2 Riser DIMM3 Riser DIMM4 Riser DIMM5 Riser DIMM6 3 SR 1 GB 1 GB 1 GB 4 SR 1 GB 1 GB 1 GB 1 GB 6 SR 1 GB 1 GB 1 GB 1 GB 1 GB 1 GB 8 MR 2 GB 1 GB 1 GB 2 GB 1 GB 1 GB 12 SR 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 24 DR 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 24 SR 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB 48 DR 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 48 DR 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB 96 DR 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 128 MR 16 GB 16 GB 8 GB 8 GB 8 GB 8 GB 16 GB 16 GB 8 GB 8 GB 8 GB 8 GB 192 QR (RHEL ONLY) 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB NOTE: If more than one Quad rank DIMM is installed within a channel (DIMM1 & DIMM4, DIMM2 & DIMM5, DIMM3 & DIMM6) then the maximum DDR3 speed is reduced to 800 MHz. Spreading Quad Rank memory modules accross multiple channels is recommended. NOTE: DDR3 DIMMs have 240 pins, the same number as DDR2, and are the same size, but are electrically incompatible and have a different key notch location. Memory Subsystem The memory subsystem consists of three DDR3 memory channels attached to each processor. All single-processor configurations have six DIMM slots (two per channel) attached to the primary processor located on the system board. Dual-processor configurations require an optional riser card that contains the secondary processor and the DIMMs associated with the secondary processor. There are six DIMM slots on the riser, for a total of twelve DIMMs in the system. DIMM slot configuration for a single processor or a second processor on the riser. Memory Slots There are six memory slots on the system board. The slots are numbered DIMM1 through DIMM6. DIMM1 is furthest from the processor. In addition, the dual-processor riser features six additional memory slots. The slots are numbered DIMM1 through DIMM6. DIMM1 is furthest from the processor. Memory Population Rules Your computer ...