M3모델은 설치가 듀얼채널을 지원하므로
두개씩 연결해야하며 한개도 가능.

Unbuffered DIMMs (UDIMMs) & Registered DIMMs (RDIMMs)

두가지 메모리 종류를 지원합니다





The following notes provide information that you must consider when you install
UDIMMs:
v The memory channels run at the fastest common frequency of the DIMMs
installed.
v Do not use both UDIMMs and RDIMMs in the same server.
30 IBM System x3250 M3 Types 4251, 4252, and 4261: Installation and User’s Guide
v Using ECC and non-ECC UDIMMs in the server will cause the server to run in
non-ECC mode.
v The UDIMM options that are available for the server are 1 GB, 2 GB, and 4 GB
DIMMs.
v You can install a maximum of 16 GB of memory in some server models when
you use UDIMMs.
v The server supports up to two single-rank or dual-rank UDIMMs per channel.
v DIMM slots 3 and 6 are not supported when you install UDIMMs in the server.
Do not install DIMMs in these connectors.

주의* 3,6번슬롯은 사용못합니다.

Registered DIMMs (RDIMMs) 장착 순서

The following notes provide information that you must consider when you install
RDIMMs:
v The memory channels run at the fastest common frequency of the installed
DIMMs.
v RDIMMs are supported in models with an Intel Xeon 3400 series processor.
v Do not use both RDIMMs and UDIMMs in the same server.
v The server supports up to three single-rank, dual-rank, or quad-rank RDIMMs per
channel.
v The RDIMM options that are available for the server are 1 GB, 2 GB, 4 GB, and
8 GB DIMMs.
Chapter 2. Installing optional devices 31
v You can install a maximum of 32 GB of memory in the server when you use
RDIMMs.