Abit NF-M2 NVIEW User Manual page 39

VGA Share Memory
This item selects the VGA share memory size.
※ The total system memory must be twice the size of this parameter at least, or
else a lesser one will replace this parameter automatically by the BIOS utility
itself. For example: In a 256M selection with 256M total system memory size
configuration, the BIOS utility will force it down to 128M automatically.
NF-M2 nView 3-11