Intel System Board G4H875-N - Manual (Page 72)

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BIOS Setup
3.1.3.8 System BIOS Cacheable
When this field is enabled, accesses to the system BIOS ROM
addressed at F0000H-FFFFFH are cached, provided that the cache
controller is enabled. The larger the range of the Cache RAM, the
higher the efficiency of the system.
3.1.3.9 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.
3.1.3.10 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.
3.1.3.11 AGP Aperture Size (MB)
This field is relevant to the memory-mapped graphics data of the
AGP card installed in your system. Leave this in its default setting.
3.1.3.12 Init Display First
This field is used to select whether to initialize the AGP or PCI first
when the system boots.
AGP When the system boots, it will first initialize the AGP.
PCI Slot When the system boots, it will first initialize PCI.