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SpeedFan is a stable, reliable program which provides fan speed control using the existing facilities on the VNF4 motherboard for temperature readout and control of power to fan connectors.
Prior to configuration for a specific system, SpeedFan displays all the temperatures, fan speeds and voltage readings that it finds. It is reasonable to get manual fan control working for the CPU as a first step in using SpeedFan; generally, SpeedFan's default settings do this automatically (fans run at 100%) although it is wise to verify because BIOS choices may affect the situation.
The remainder of this document covers configuring SpeedFan for the VNF4 although the material may be generally useful with other mobo's. The following descriptions are ordered according to the tabs on SpeedFan's Configure screen, proceeding from left to right. In addition, sensors may be renamed so it is easier to remember what they are measuring; this has been done for the VNF4 in all screens shown in this section. The VNF4's CPU temperature is measured by a diode, probably on the CPU because it reacts quickly to changes in CPU load.
To set the "Desired" or target temperature click on the "Sample" column for the selected item, CPU.
Set the "Warning" CPU temperature to a value which should not be reached in normal use but which is well below the damage point.
To associate a sensor with the fan for control, click the "+" to the left of the sensor to show the drop down list, then click on the desired fan. As a safety measure, SpeedFan will apply 100% when the controlled temperature exceeds the Warning temperature you set. In my system SpeedFan controls another fan to cool the NF4 so PWM2 is Software controlled -- a less common scheme so you most likely won't do this.
In v4.25, if no events are programmed then an error appears at the end of the list of sensors found on the board.
Once you choose "Software controlled" SpeedFan is controlling the fan speed and YOU are controlling SpeedFan. Once you're sure SpeedFan is controlling fan speed properly, check the lower limit setting of the controlled fan(s) to be certain that they don't stop.
My conclusion, based on numerous experiments on my system, is that SpeedFan's control loop gain is too high when the error(difference between the measured and target temperature values) is small and conversely, the gain is too low when the error is large (e.g. Perhaps the simplest way to reduce gain for small errors would be to add a counter for each fan. A different (similar but more complicated) way to improve speed stability would be to eliminate the setting for "Delta value for fan speeds". So, there are a number of ways to address fan speed instability, with various amounts of programming effort to write and debug. Preserving the chart selections while SpeedFan is running would be helpful; no need to preserve them between starts.
A problem with using the Fan3 connection to control the NF4 fan is that this connector defaults to OFF in BIOS so this fan doesn't run until WinXP starts SpeedFan.
In this picture, the chipset fan is plugged into the connector labeled "Fan3 Case Fan" so it can be controlled by SpeedFan. My VNF4 board died and a replacement Athlon 439 type board was not easily available so I replaced it with a Foxconn A7DA-S board, AMD 4850e, and 2GB of Corsair DDR2 memory in December 2008.
I installed Speedfan on the A7DA-S and it found several temperatures but some were biased by +15C, i.e.

Speedfan shows all three 8712F temperature readings seem to be from legitimate sensors so I assigned names to them by guessing what they're measuring.
A peculiarity noted with my AMD retail CPU fan on this board is that even when the PWM is set to zero with Speedfan the CPU fan continues to spin slowly. Other than Foxconn's unhelpful attitude on the temperature readout and BIOS fan control issues, I like the Foxconn board better than any of the other mobo's I've built. The Open Hardware Monitor is a free open source software that monitors temperature sensors, fan speeds, voltages, load and clock speeds of a computer. The Open Hardware Monitor supports most hardware monitoring chips found on todays mainboards. Added support for fan control on ITE 87XX chips and a mainboard specific configuration for the Gigabyte GA 970A UD3 (both based on a patch from Eric Hokanson).
Fixed an error where loading config files from previous versions would crash the application.
The temperature in the system tray icons are now shown correctly in Fahrenheit when using Fahrenheit as temperature unit. Improved the data compression for storing the recorded sensor values in the configuration file.
Changed the license to the Mozilla Public License 2.0 and update the licensing information. Added an option to show the sensor-plot in a separate window or on the right of the tree-view. Added support for saving and restoring the sensor history as shown in the plot for the last 24h.
Added a context menu to the plot which allows the user to configure the time window for plotting. Further restricted the identification for Indilinx SSDs to prevent Maxtor HDDs to be identified as Indilinx SSD. The most lightweight of them are Actual Booster (sized at 107,531) and Power4 Gear (sized at 396,302), while the largest one is AI Suite II with 76,677,800 bytes. On startup SpeedFan scans the SMB and ISA busses, automatically finding all sensors on the motherboard.
This simplifies initial testing as well as further configuration - everything available is visible (along with a few items that aren't really available so they produce erroneous readings).
The associated fan(s) will go to 100% speed if the Warning temperature is exceeded so the fan noise may provide a warning of sorts. Verify all sensors in this manner to ensure that only the desired sensor(s) are controlling the fan. Within 3 seconds the "Speed CPU %" should show a value within the control limits you set earlier.
The line which slopes up to the right is SmartGuardian's temperature vs fan speed characteristic. This is conceptually simpler because it isn't a normal closed loop feedback control system, subject to Nyquist type criteria to avoid oscillation. To make a reasonable guess as to which temperature represented the CPU I tried adjusting the 8712F's PWM1 and found it controlled the CPU fan (lucky guess). The A7DA-S manual is the best I've seen, very clearly written with good illustrations and it actually covers points that caused questions on other boards I've used.

When you proceed to the checkout page, the Seller Discount will be automatically calculated.
The CPU temperature can be monitored by reading the core temperature sensors of Intel and AMD processors. The report now contains a list of all SMART attributes with the labels as identified by the Open Hardware Monitor.
Check the "Automatically variated" box to enable automatic control (there are more steps needed to completely enable auto control). The above screen shows the results of adjusting the Minimum fan speed, where the stable section near the center is with the fan above the critical value.
It simply requires minimum and maximum temperatures in addition to minimum and maximum PWM%'s. The A7DA-S board is nicely laid out and well constructed, plus the connector and part designations are easily readable. The sensors of ATI and Nvidia video cards as well as SMART hard drive temperature can be displayed.
When setting the minimum value, avoid setting the value so low that the fan stops -- it often takes a large change to restart a fan after it stops. Speedfan can offset temperatures for calibration so this allows Speedfan's display to make sense. The monitored values can be displayed in the main window, in a customizable desktop gadget, or in the system tray. The Winchester CPU's generally heat up slowly even with the fan off so if you're fiddling with only the CPU fan there is plenty of time to check and correct for rising temperatures. This constant temperature reading apparently prevents the SmartGuardian function in our old friend, the IT8712F chip, from controlling the fan speed properly. My rough calibration method is to note the readings on startup and ensure that they are only slightly greater than room temperature, or about 20C.
Since my 4850e is fairly low power the temperatures remain safe but this could be an issue with a Phenom. Select "Software controlled" for only the CPU fan initially so you only have one thing to watch while you work out any kinks. Best guess is BIOS doesn't initialize the IT8712F (actually the IT8716F, a newer version) properly.
The basics on configuring and using Speedfan are covered in my earlier tome (above) on Speedfan setup for the VNF4 so I used that to recall how to use Speedfan since I haven't used it to adjust anything for years now.
Here is the system at startup, showing part of the slow CPU fan rampdown and the startup of NF4 fan instability. Other A7DA-S owners have also reported constant 40C readings from BIOS and Fox One in the Foxconn Forum so I'm not alone on this.
This approach might "hunt" in a small range but shouldn't oscillate between the PWM% limits as the present approach often does.

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