MSI Keeper 945GME V2.0 User Manual
Page 18
M S-9641 M ainboard
2-6
The mainboard provides 2 slots for 240-pin DDRII DIMM, which supports the memorysize
up to 2GB.Since DDRII modules are not interchangeable with DDR1 and the DDRII
standard is not backward compatible, you should always install DDRII memory mod-
ule in the DDRII slot (DIMM0~DIMM1). Otherwise, you are not able to boot up your
system and your mainboard might be damaged.
DIM M1
DIM M0
Memory
Introduction to DDRII SDRAM
DDRII is a new technology of memory module, and its speed is the top limit of current
DDR1 technology. DDRII uses a 1.8V supply for core and I/O voltage, compared to 2.
5V for DDR1, and requires 28% less power than DDR1 chips. DDRII truly is the future
of memory, but will require some changes as the technology is not backwardly
compatible and only motherboards specifically designed for DDRII memory will be
able to support these chips.
DDRII incorporates new features at the chip level that give it better signal integrity,
thereby enabling higher clock speeds.
DDRII modules have 240 pins, versus 184 pins on a DDR1 module, and the length of
DDRII module is 5.25
”. DDRII modules have smaller and tighter spaced pins. The height
of DDRII modules varies, but they will typically be less than 1.3
” in height.
DIMM Module Combination
Install at least one DIMM module on the slots. Each DIMM slot supports up to a maximum
size of 2GB. Users can install either single- or double-sided modules to meet their
own needs. Please note that each DIM M can work respectively for single-
channel DDRII, but there are some rules while using dual-channel DDRII.
Users may install memory modules of different type and density on different-channel
DDR DIMMs. However, the same size, type and density memory modules are
necessary while using dual-channel DDR, or instability may happen. Please refer to
the following table for detailed dual-channel DDR. Other combination not listed below
will function as single-channel DDR.
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