User Guide

Frequently Asked Questions
B-8
A: The Soft Power On of the ATX specification means to provide a standby current
for special circuit to wait for wakeup event when main power is off. For
example, Infrared wakeup, modem wakeup, or voice wakeup. Currently, the
most simple usage is to provide standby current for power switch circuit so that
power switch can turn on/off the main power through soft power control pin. The
ATX power specification does not mention anything about the power switch
type. You can use toggle or momentary switch, note that ACPI specification
requires momentary switch for power state control. All the AOpen ATX MBs
support momentary switch and AX5T/AX58/AX6L support modem wakeup
(Modem Ring-On).
Soft Power Off means to turn off system through software, Windows 95
Shutdown function can be used to verify if your mainboard supports soft power
off. AOpen AX5T/AX58/AX6F/AX6L support soft power off.
Q: What is the AGP (Accelerated Graphic Port)?
A: AGP is a PCI-like bus interface targeted for high-performance 3D graphic. AGP
supports only memory read/write operation and single-master single-slave
one-to-one only. The AGP uses both rising and falling edge of the 66MHz clock
and produces 66MHz x 4byte x 2 = 528MB/s data transfer rate. The AOpen
AX6L MB are designed to support AGP via the new Intel Klamath LX chipset.
Q: Which Pentium chipset has the best performance?
A: The performance difference of chipset depends on what kind of DRAM they use
and the DRAM timing they support. (They all use PBSRAM, so that the
difference is very little at 2nd level cache.)
The following table lists the read timing of current available chipsets. The four
digital represents the clocks needed for 1st-2nd-3rd-4th QWord. Notice that the
Intel HX + EDO or SIS 5571+ EDO are almost the same as VX + SDRAM and
the TX + SDRAM has the best performance among Pentium chipsets. Please
note AP57 does not support SDRAM.