Re: SM Bus on a P4C800-E Deluxe
- From: nospam@xxxxxxxxxx (Paul)
- Date: Fri, 14 Jul 2006 18:03:25 GMT
In article <Xns9800571C88063Mark1234@xxxxxxxxxxxxxxxxxx>, Mark
<Mark@nolocation!.com> wrote:
Hi,
Is there a driver or something that controls the SM bus that can be
updated or downgraded?
With all the P4C800-E Deluxe motherboards, along with Antec power
supplies, that were sold over the years, you would think there would be
far more people posting about a Divisor issue. Therefore, if it's that
unique of a problem then it's likely something broke on this
motherboard. Would you agree?
I thought the substance of our previous discussion on this was:
1) The BIOS loads an initial value for the divider inside the
fan monitor chip. That divider value would be used by the
BIOS to monitor fan speed. If the fan speed is out of range
(where the minimum fan speed is determined by the divider),
then the BIOS may conclude the fan speed is zero, causing
the POST to fail perhaps, and require manual intervention
during boot. I have a motherboard that requires this
intervention, as my power supply fan (which is connected and
monitored), starts below 1800RPM when the PSU is cool. The
BIOS reads the fan as zero and prompts me to enter the BIOS
and fix it.
2) Monitoring programs can change the divider value in the
monitor chip. The nicest programs "autorange" the divider,
adjusting the value until the fan RPMs can be read, while
at the same time, selecting a value with optimal dynamic
range. The dumb program, may continue to use the value
loaded by the BIOS. Only user testing can determine which
Windows utility to use.
What I don't know in every case, is what happens when Q-fan
is enabled, and whether the BIOS code will try to change
register values and fight with a Windows monitoring program.
Disabling Q-fan and using SpeedFan in Windows, might be
a solution that allows fan speed control without BIOS
interference.
To fix (1), where the boot is halted by a monitored fan
being detected as reading 0 RPM, the only fix would be to
hack the BIOS and change the initial value written into
the chip. And that is not likely to happen, as the code
for that is contained in some larger module, and is not
separated out for easy surgery by hackers.
HTH,
Paul
.
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