Green DIMM1 (Ch A) Purple DIMM2 (Ch B) Green DIMM3 (Ch A) Purple DIMM4 (Ch B) System Density
128MB ~ 1GB 128MB ~ 1GB - - 256MB ~ 2GB
- - 128MB ~ 1GB 128MB ~ 1GB 256MB ~ 2GB
128MB ~ 1GB 128MB ~ 1GB 128MB ~ 1GB 128MB ~ 1GB 512MB ~ 4GB

MSI Reminds You...
• Dual-channel DDR works ONLY in the 3 combinations listed in the table shown above.
• Please select the identical memory modules to install on the dual channel, and DO NOT
.............

http://www.msicomputer.com/product/...Neo4-F&class=mb
==============

看清楚吧....
• Dual-channel DDR works ONLY in the 3 combinations listed in the table shown above

3 combinations :就是指1-2 or 3-4 or 1-2-3-4 !