Memory; Introduction To Ddr2 Sdram - MSI Hetis 945 User Manual

2.3 Memory

The mainboard provides 2 slots for 240-pin DDR2 DIMM, which supports the
memorysize up to 2GB.Since DDR2 modules are not interchangeable with DDR1 and
the DDR2 standard is not backward compatible, you should always install DDR2 memory
module in the DDR2 slot (DIMM1~DIMM2). Otherwise, you are not able to boot up your
system and your mainboard might be damaged.

Introduction to DDR2 SDRAM

DDR2 is a new technology of memory module, and its speed is the top limit of
current DDR1 technology. DDR2 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. DDR2
truly is the future of memory, but will require some changes as the technology is not
backwardly compatible and only motherboards specifically designed for DDR2
memory will be able to support these chips.
DDR2 incorporates new features at the chip level that give it better signal
integrity, thereby enabling higher clock speeds.
DDR2 modules have 240 pins, versus 184 pins on a DDR1 module, and the
length of DDR2 module is 5.25". DDR2 modules have smaller and tighter spaced pins.
The height of DDR2 modules varies, but they will typically be less than 1.3" in height.
DIMM1~2
2-8