Asus DSBF-D 1U User Guide - Page 38

2.4 System memory 2.4.1 Overview The motherboard comes with eight 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: ® DSBF-D Series 128 Pins DSBF-D Series 240-pin FB-DIMM sockets 112 Pins DIMM_31 DIMM_30 DIMM_21 DIMM_20 DIMM_11 DIMM_10 DIMM_01 DIMM_00 2.4.2 Memory 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. 2-16 Chapter 2: Hardware information