MSI 865PE NEO2-LS User Guide - Page 28
Memory
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Hardware Setup Memory The mainboard provides 4 slots for 184-pin, 2.5V DDR DIMM with 8 memory banks. You can install DDR266/DDR333/DDR400 SDRAM modules on the DDR DIMM slots (DIMM 1~4). To operate properly, at least one DIMM module must be installed. BATT + DDR DIMM Slots (DDR 1~4, from left to right) Channel A: DIMM1 & DIMM2 Channel B: DIMM3 & DIMM4 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. Please note that the DDR SDRAM does not support ECC (error correcting code) and registered DIMM. DDR Population Rules Install at least one DIMM module on the slots. Each DIMM slot supports up to a maximum size of 1GB. Users can install either single- or double-sided modules to meet their own needs. Please note that each DIMM can work respectively for single-channel DDR, but there are some rules while using dual-channel DDR (Please refer to the suggested DDR population table on p. 2-8).Users may install memory modules of different type and density on different- 2-7