Memory Options - IBM System x3500 M4 Product Manual

Memory options

The IBM System x3500 M4 supports DDR3 memory. The server supports up to 12 DIMMs when one
processor is installed and up to 24 DIMMs when two processors are installed. Each processor has four
memory channels, and there are three DIMMs per channel. The following rules apply when selecting the
memory configuration:
The server supports UDIMMs, RDIMMs, and LRDIMMs.
Mixing different types of memory (UDIMMs, RDIMMs, and LRDIMMs) is not supported.
Mixing 1.5 V and 1.35 V DIMMs in the same server is supported. In such a case all DIMMs operate at
1.5 V.
The maximum number of ranks per channel is eight (with the exception of Load Reduced DIMMs,
where more than eight ranks are supported because one quad-rank LRDIMM provides the same
electrical load on a memory bus as a single-rank RDIMM).
The maximum quantity of DIMMs that can be installed in a server depends on the number of CPUs,
DIMM type, rank, and operating voltage, as shown in the "Max. qty supported" row in Table 4.
All DIMMs in the server operate at the same speed, which is determined as the lowest value of:
Memory speed supported by specific CPU
Lowest maximum operating speed for the selected memory configuration that depends on rated
speed, operating voltage, and quantity of DIMMs per channel, as shown in the "Max. operating
speed" section in Table 4
Table 4. Maximum memory speeds
DIMM type UDIMM
DIMM specification
Rank Dual rank
Rated speed 1333 MHz
Rated voltage 1.35 V
Operating voltage 1.35 V
Max. qty 16
supported*
Max. DIMM 2 GB
capacity
Max. memory 32 GB
capacity
Max. operating ______ ______ ______ ______ _______ _______ _______
speed
1 DIMM per 1333
channel MHz
2 DIMMs per 1066
channel MHz
3 DIMMs per NS**
channel
* The maximum quantity supported is shown for two processors installed. When one processor installed the maximum
quantity supported is a half of that shown.
** NS = Not supported.
IBM System x3500 M4
RDIMM
Single rank Dual rank
1333 MHz 1333 MHz
1.35 V 1.35 V
1.5 V 1.35 V 1.5 V 1.35 V
16 16 24 16
2 GB 4 GB 4 GB 16 GB
32 GB 64 GB 96 GB 256GB
1333 1333 1333 1333
MHz MHz MHz MHz
1333 1333 1333 1333
MHz MHz MHz MHz
NS** NS** 1066 NS**
MHz
Quad rank
1600 MHz 1066 MHz
1.5 V 1.35 V
1.5 V 1.5 V 1.35 V
24 24 16
16 GB 4 GB 16 GB
384GB 96GB 256GB
_______ _______ _______ _______
1333 1600 800
MHz MHz MHz
1333 1600 800
MHz MHz MHz
1066 1066 NS**
MHz MHz
LRDIMM
Quad rank
1333 MHz
1.35 V
1.5 V 1.35 V 1.5 V
16 24 24
16 GB 32 GB 32 GB
256GB 768GB 768GB
1066 1333 1333
MHz MHz MHz
800 1066 1333
MHz MHz MHz
NS** 1066 1066
MHz MHz
10