MSI 661FM2-LSR User Guide - Page 19

Memory, DDR DIMM Slots, DDR 1~2, Introduction to DDR SDRAM

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Page 19 highlights

Hardware Setup Memory The mainboard provides two 184-pin unbuffered DDR266/DDR333/DDR400 DDR SDRAM, and supports the memory size up to 2GB without ECC. To operate properly, at least one DIMM module must be installed. (For the updated supporting memory modules, please visit http://www.msi.com.tw/ program/products/mainboard/mbd/pro_mbd_trp_list.php ) DDR DIMM Slots (DDR 1~2) Introduction to DDR SDRAM DDR (Double Data Rate) SDRAM is similar to conventional SDRAM, but doubles the rate by transferring data twice per cycle. It uses 2.5 volts as opposed to 3.3 volts used in SDR SDRAM, and requires 184-pin DIMM modules rather than 168-pin DIMM modules used by SDR SDRAM. 2-7

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2-7
Hardware Setup
Memory
The mainboard provides two 184-pin unbuffered DDR266/DDR333/DDR400 DDR SDRAM,
and supports the memory size up to 2GB without ECC. To operate properly, at least one
DIMM module must be installed.
(For the updated supporting memory modules, please visit http://www.msi.com.tw/
program/products/mainboard/mbd/pro_mbd_trp_list.php )
DDR DIMM Slots
(DDR 1~2)
Introduction to DDR SDRAM
DDR (Double Data Rate) SDRAM is similar to conventional SDRAM, but doubles the rate
by transferring data twice per cycle. It uses 2.5 volts as opposed to 3.3 volts used in
SDR SDRAM, and requires 184-pin DIMM modules rather than 168-pin DIMM modules
used by SDR SDRAM.