For servers with twelve (12) memory slots:

• There are three (3) channels per processor; six (6) channels per server

• There are two (2) DIMM slots for each memory channel; twelve (12) total slots

• Memory channel 1 consists of the two (2) DIMMs that are closest to the processor

• Memory channel 3 consists of the two (2) DIMMs that are furthest from the processor

DIMM slots that are white should be populated first

Do not mix Unbuffered memory (UDIMMs) with Registered memory (RDIMMs)

Do not install DIMMs if the corresponding processor is not installed

If only one processor is installed in a 2CPU system, only half of the DIMM slots are available

To maximize performance, balance the total memory capacity between all installed processors

It is not required, but it is recommended to load the channels similarly if possible

You can only have up to eight (8) ranks installed per channel

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You can only install two quad-rank DIMMs per channel

You can only install two UDIMMs per channel; if available, the third slot in the channel must remain empty

Populate DIMMs from heaviest load (quad-rank) to lightest load (single-rank) within a channel

Heaviest load (DIMM with most ranks) within a channel goes furthest from the chipset

For memory mirroring mode, channel 3 must be unpopulated. Channels 1 and 2 are populated identically

For lock-step mode, channel 3 must be unpopulated. DIMMs in channels 1 and 2 will be installed in pairs. The paired slotswill be 1,4; 2,5; 3;6 on a 3DPC system or 1,4; 2,5; on a 2DPC system

No mixing DIMM voltage; all DIMMs must be the same voltage

Mixing DIMM speeds is allowed, but the system processor speed rules always override the DIMM capabilities

If you do mix DIMM speeds, the memory bus will default to the minimum clock rate of all DIMMs in the system - even if theslower DIMM is on the other processor

If you install 1x 1066 MHz DIMM in channel 1 and 1x 1333 MHz DIMM in channel 2, you still run at 1066 MHz

If you install 1x 1066 MHz DIMM in channel 1 and 5x 1333 MHz DIMMs with 1 DIMM Per Channel (DPC) in each of the otherchannels, you run at 1066 MHz

If you install 3DPC in one channel (if applicable) and 1DPC in all other channels, you run at 800 MHz

95 Watt CPU's are required for 1333 MHz DIMM speeds. All other CPU's are capable of up to 1066 MHz

References to the above MHz speeds are for the various speeds of DDR3 DIMMs; 1333 refers to DDR3-1333, etc.