Here is what it says from MSI
MSI Computer Corp. - Product

Main Memory

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Supports Four memory banks using two 184-pin unbuffered DDR333/400 DDR DIMM.
• Supports up to 2GB memory size.
• Supports 2.5v DDR SDRAM.
Due to the High Performance Memory design, motherboards or system configurations may or may not operate smoothly at the JEDEC (Joint Electron Device Engineering Council) standard settings (BIOS Default on the motherboard) such as DDR voltage, memory speeds and memory timing. Please confirm and adjust your memory setting in the BIOS accordingly for better system stability.
Example: Kingston HyperX DDR500 PC4000 operates at 2.65V, 3-4-4-8, CL=3.
For more information about specification of high performance memory modules, please check with your Memory Manufactures for more details.

MSI -- MICRO-STAR INT'L CO., LTD.