DFI G5C100-NR - Manual (Page 79)

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BIOS Setup
Video BIOS Cacheable
As with caching the system BIOS, enabling the Video BIOS cache will
allow access to video BIOS addresssed at C0000H to C7FFFH to
be cached, if the cache controller is also enabled. The larger the range
of the Cache RAM, the faster the video performance.
Memory Hole At 15M-16M
In order to improve system performance, certain space in memory can
be reserved for ISA cards. This memory must be mapped into the
memory space below 16MB. When enabled, the CPU assumes the 15-
16MB memory range is allocated to the hidden ISA address range
instead of the actual system DRAM. When disabled, the CPU assumes
the 15-16MB address range actually contains DRAM memory. If more
than 16MB of system memory is installed, this field must be disabled
to provide contiguous system memory.
PCI/Onchip VGA Control
Onchip VGA Select this option if you want the system to boot the
onboard VGA.
PCI Port Select this option if you want the system to boot the
graphics PCI add-in card.
On-Chip Frame Buffer Size
This field is used to select the onboard VGA’s frame buffer size that
is shared from the system memory.
DVMT Mode
This field shows the current DVMT mode.
DVMT/Fixed Memory Size
This field is used to select the graphics memory size used by DVMT/
Fixed mode.