IBM System x3690 X5 Installation And User Manual page 64

v The server supports 1.35-volt (low-voltage) and 1.5-volt DIMMs. In addition,
v Some server models come with the Intel 7500 scalable memory buffer or the
v Double-device data correction support is only available when 16 GB x4 DRAM
v The following table provides information about the maximum amount of
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System x3690 X5 Types 7147, 7148, 7149, and 7192: Installation and User's Guide
16 = x16 organization
- wwwww is the DIMM bandwidth, in MBps
6400 = 6.40 GBps (PC3-800 SDRAMs, 8-byte primary data bus)
8500 = 8.53 GBps (PC3-1066 SDRAMs, 8-byte primary data bus)
10600 = 10.66 GBps (PC3-1333 SDRAMs, 8-byte primary data bus)
12800 = 12.80 GBps PC3-1600 SDRAMs, 8-byte primary data bus)
- m is the DIMM type
E = Unbuffered DIMM (UDIMM) with ECC (x72-bit module data bus)
R = Registered DIMM (RDIMM)
U = Unbuffered DIMM with no ECC (x64-bit primary data bus)
- a is the CAS latency, in clocks at maximum operating frequency
- b is the JEDEC SPD Revision Encoding and Additions level
- c is the reference design file for the design of the DIMM
- d is the revision number of the reference design of the DIMM
support is based on machine type as noted below:
– Machine Types 7148 and 7149:
- Supports 1.5-volt DIMMs only
– Machine Types 7147 and 7192:
- Supports low-voltage (1.35-volt) DIMMs at capacities of 4 GB, 8 GB, and 16
GB only.
- When you mix 1.35-volt and 1.5-volt DIMMs in the server, the server will
operate at the 1.5-volt rate.
- You can enable all DIMMs (1.35-volt and 1.5-volt) to operate at 1.5-volt in
the Setup utility.
Intel 7510 scalable memory buffer:
– Machine Types 7148 and 7149 comes with the Intel 7500 scalable memory
buffer
– Mechine Types 7147 and 7192 comes with the Intel 7510 scalable memory
buffer
technology DIMMs are installed in the server.
memory that the server can support when you fully populate the server, the
optional memory tray, and the optional IBM MAX5 for System x memory
expansion module using the supported DIMMs.
Table 5. The maximum amount of memory that server can support
Number of DIMM connectors
16 DIMMs on system board
16 DIMMs on the optional memory tray
32 DIMMs on the optional IBM MAX5 for
System x memory expansion module
Note: The server can support a maximum 1 TB of system memory when both the optional
memory tray and an optional IBM MAX5 for System x memory expansion module is
installed and fully populated with 16 GB DIMMs.
Maximum memory
up to 256 GB
up to 256 GB
up to 512 GB
Total = 1 TB of memory