KG7 / KG7-RAID supports up to 2GB of unbuffered memory and 4GB
of registered memory.
Please mention that the maximum DDR memory support of KG7 / KG7-RAID
is about 3.5G rather than 4G. This limitation is caused by PC architecture
and the missing 0.5G memory address is reserved for PCI I/O space,
AGP aperture mapping space and other onboard device I/O space, so,
although the AMD761 datasheet exclaims the memory support is up
to 4GB, actually the system only use about 3.5GB with four 1G DDR
memories installed. In another word, BIOS and operation system will
report about 3.5GB only.
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