Intel E3-1220L v3 CM8064601467804 User Manual

The IMC supports Intel Flex Memory Technology Mode. Memory is divided into

symmetric and asymmetric zones. The symmetric zone starts at the lowest address in

each channel and is contiguous until the asymmetric zone begins or until the top

address of the channel with the smaller capacity is reached. In this mode, the system

runs with one zone of dual-channel mode and one zone of single-channel mode,

simultaneously, across the whole memory array.

Channels A and B can be mapped for physical channel 0 and 1 respectively or vice

versa; however, channel A size must be greater or equal to channel B size.

CH B

CH A

B

B

C

B

B

C

CH A and CH B can be configured to be physical channels 0 or 1

B – The largest physical memory amount of the smaller size memory module

C – The remaining physical memory amount of the larger size memory module

Dual-Channel Symmetric mode, also known as interleaved mode, provides maximum

performance on real world applications. Addresses are ping-ponged between the

channels after each cache line (64-byte boundary). If there are two requests, and the

second request is to an address on the opposite channel from the first, that request

can be sent before data from the first request has returned. If two consecutive cache

lines are requested, both may be retrieved simultaneously, since they are ensured to

be on opposite channels. Use Dual-Channel Symmetric mode when both Channel A

and Channel B DIMM connectors are populated in any order, with the total amount of

memory in each channel being the same.

When both channels are populated with the same memory capacity and the boundary

between the dual channel zone and the single channel zone is the top of memory, the

IMC operates completely in Dual-Channel Symmetric mode.

The DRAM device technology and width may vary from one channel to the other.

Intel

®

 Xeon

®

 Processor E3-1200 v3 Product Family

Datasheet – Volume 1 of 2

June 2013

20

Order No.: 328907-001