2.4System memory

2.4.1Overview

The motherboard comes with six fully-buffered DIMM (FB-DIMM) sockets to support 240-pin FB-DIMM modules. An FB-DIMM module has a different pin-out from DDR2 DIMMs so you cannot install DDR2 DIMMs on an FB-DIMM socket. Note that an FB-DIMM socket has an Advanced Memory Buffer (AMB) chip that allows memory-to-CPU connection at gigabit speed.

The figure illustrates the location of the FB-DIMM sockets:

Z7S WS

128 Pins 112 Pins

DIMM_00

DIMM_01

DIMM_10

DIMM_11

DIMM_20

DIMM_30

Z7S WS 240-pin DDR2 FB-DIMM sockets

2.4.2Memory configurations

You may install 256 MB, 512 MB, 1 GB, 2 GB, and 4 GB registered ECC FB‑DIMMs into the DIMM sockets.

•For optimum compatibility, we recommend that you obtain memory modules from the same vendor. Refer to the Qualified Vendors List on the ASUS web site.

•This motherboard does not support memory modules made up of 128 Mb chips or double-rank x16 memory modules.

•If you are installing only one memory module, install into the white socket labeled DIMM_00. Installing into any other socket will not work.

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Chapter 2: Hardware information