System Memory - IBM SurePOS 700 Series Hardware Service Manual

Table 2. Features and options (continued)
Attribute Models 723 and E23
PC I/O
No USB on front
Two standard RS-232
on rear
Diskette
drive
Standby
power

System memory

All system boards have two or four memory slots. The factory-installed base
memory occupies one of the slots. Empty slots depend on the initial order for base
memory.
v Models 723 and E23 use 533 MHz DDR2 DIMMs with 256 MB standard, 2 GB
v Models 743, C43, and E43 use 667 MHz DDR2 DIMMs with 512 MB standard, 4
v Models 783 and E83 use 667 MHz DDR2 DIMMs with 512 MB standard, 4 GB
v Models 784, C84, and E84 use 1066 MHz DDR3 DIMMs with 1 GB standard, 8
Note: Use only memory provided by IBM Retail Store Solutions. Not all third-party
Models 784, C84, and E84 support dual channel memory, which can provide
increased performance over single channel configurations, depending on the
operating system and application. An evaluation of the need for dual channel
memory operation should be done on a solution-by-solution basis. Dual channel or
single channel modes are configured automatically by the system BIOS when the
memory configuration is first detected.
Models 784, C84, and E84 system boards have two pairs of differently colored
DIMM sockets. The colors indicate to which bank they belong: bank 0 or bank 1.
Dual channel mode means that the DIMM has a matched configuration for each
channel. Refer to Table 3 on page 4 for information about populating slots.
Dual channel mode can be achieved with two, three or four DIMMs, but you must
have the same density (1 GB, 2 GB, and so on), the same DRAM (512 Mb, 1 Gb,
or 2 Gb), and the same DRAM bus width (x8 or x16). All memory channels must be
either all single-sided or all dual-sided with symmetrical memory banks 0 or 1. If
your configuration does not match in regard to all of the previous conditions, the
mode will revert to single channel mode. It does not matter whether you use (or do
not use) the same brand of memory, the same DDR speed, or have the same
Models 743, C43,
and E43
PS/2 keyboard and mouse
Two PC USB 2.0 on rear
Internal uninterruptible power supply (optional - wide only)
maximum (two slots).
GB maximum (two slots).
maximum (two slots).
GB maximum (four slots).
memory modules work with every product. IBM performs extensive life and
reliability testing to ensure that the memory offered by IBM will operate
correctly over all voltage and temperature ranges.
Models 783 and E83
One 12 V POS USB 2.0 on front
Four standard RS-232 on rear
External USB (optional)
Chapter 1. Introducing the SurePOS 700 models
Models 784, C84, and E84
3