S5000PAL datasheet(29/112 Pages) INTEL

29 / 112 page

Functional Architecture

Intel

® Server Board S5000PAL / S5000XAL TPS

Revision 1.7

Intel order number: D31979-010

3.1.3.4

Non-mirrored mode memory upgrades

The minimum memory upgrade increment is two DIMMs per branch. The DIMMs must cover the same

slot position on both channels. DIMMs pairs must be identical with respect to size, speed, and

organization. DIMMs that cover adjacent slot positions do not need to be identical.

When adding two DIMMs to the configuration shown in Figure 12, the DIMMs should be populated in

DIMM slots C1 and D1 as shown in the following diagram. Populated DIMM slots are shown in Grey.

TP02301

DIMM

Branch 0

MCH

Channel A

Channel B

Channel D

Channel C

Branch 1

Figure 13. Recommended Four DIMM Configuration

Functionally, DIMM slots A2 and B2 could also have been populated instead of DIMM slots C1 and D1.

However, your system will not achieve equivalent performance. Figure 13 shows the supported DIMM

configuration that is recommended because it allows both memory branches from the MCH to operate

independently and simultaneously. FBD bandwidth is doubled when both branches operate in parallel.

3.1.3.4.1

Mirrored Mode Memory Configuration

When operating in mirrored mode, both branches operate in lock step. In mirrored mode, branch 1

contains a replicate copy of the data in branch 0. The minimum DIMM configuration to support memory

mirroring is four DIMMs, populated as shown in Figure 13 above. All four DIMMs must be identical with

respect to size, speed, and organization.

To upgrade a four DIMM mirrored memory configuration, four additional DIMMs must be added to the

system. All four DIMMs in the second set must be identical to the first with the exception of speed. The

MCH will adjust to the lowest speed DIMM.

S5000PAL 데이터시트(PDF) 29 Page - Intel Corporation