Abit CX6, User Manual

Page: 54 / 114

3-20 Chapter3
CX6
Memory Hole At 15M-16M:
Two options are available: Enabled and Disabled. The default setting is Disabled . This
option is used to reserve the memory block 15M-16M for ISA adapter ROM. Some special
peripherals need to use a memory block located between 15M and 16M, and this memory
block has a size of 1M. We recommend that you disable this option.
Delayed Transaction:
Two options are available: Enabled and Disabled. The default setting is Disabled . Set the
option to enabled or disabled PCI 2.1 features including passive release and delayed
transaction for the chipset. This function is used to meet the latency of PCI cycles to or from
the ISA bus. This option must be enabled to provide PCI 2.1 compliance. If you have an ISA
card compatibility problem, you can try to enable or disable this option for optimal results.
AGP Fast Write
AGP Fast Writes are accelerated memory write transactions that occur when the AGP
chipset supports Fast Writes and when both the AGP chipset and the display chipset are
configured for Fast Writes. The Intel 820 chipset supports AGP Fast Write. Therefore, if
your AGP card supports AGP Fast Write, you can set this item to Enabled. It can shorten the
latency time between the AGP Bus command start and the AGP Bus data transfer, and then
gives you better AGP write/transfer speed.
AGP Aperture Size (MB):
Seven options are available: 4 . 8 . 16 . 32 . 64 . 128 . 256 . Back to 4. This
option specifies the amount of system memory that can be used by the AGP device. The
aperture is a portion of the PCI memory address range dedicated for graphics memory
address space.