I use 1GB or 1.5GB size SDRAM on this M/B, Windows ME O.S. shows "Error Message: Insufficient Memory to Initialize Windows", but 512MB is works fine.
This is Windows 9x / ME O.S. limited, Windows NT 4.0 / 2000 / XP no problem, user can browse the following web address to get solution. http://support.microsoft.com/support/kb/articles/q184/4/47.asp