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#1
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P4C800E Dlx and Fan Speed Control ???
I can get both BIOS's own Q-FAN, and the SpeedFan Windows
application to successfully vary the speed of the CPU fan. However, I can't get either to vary the speed of either the power supply (PWR) or case (CHA) fans. Has anyone else worked with fan speed control with this motherboard? If so, how successful have you been in controlling the three fans (CPU,PWR,CHA) ??? I am going to be pretty disappointed if ASUS once again screwed up their MB wiring and fan speed control isn't fully possible. ASUS already got me once with NO fan speed control on my old P4B266-C. |
#2
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You need to disable Q-Fan in Bios, and in SpeedFan you have to go
under the 20% limit to notice a change in noise/rpm... So on... hand Daniel -- Composed with Newz Crawler 1.7 http://www.newzcrawler.com/ |
#3
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In article , wrote:
I can get both BIOS's own Q-FAN, and the SpeedFan Windows application to successfully vary the speed of the CPU fan. However, I can't get either to vary the speed of either the power supply (PWR) or case (CHA) fans. Has anyone else worked with fan speed control with this motherboard? If so, how successful have you been in controlling the three fans (CPU,PWR,CHA) ??? I am going to be pretty disappointed if ASUS once again screwed up their MB wiring and fan speed control isn't fully possible. ASUS already got me once with NO fan speed control on my old P4B266-C. Q-Fan is intended to control the CPU fan, and uses the CPU temperature for feedback about the setting to use. I just downloaded the W83627THF Winbond datasheet, and this chip has three fan speed controllers. They are not the normal PWM (pulse width modulation) controls, but are a simple 0-5V level instead. This requires a buffer circuit to drive the 12V fan, and those cost a few extra pennies. http://www.winbond-usa.com/products/...PCIC/627hf.pdf I only see a transistor around the CPU fan header. (The op amp to drive the transistor could be housed in a quad device elsewhere on the motherboard.) The other fan headers don't seem to have anything like that. Without a power transistor of some sort, it won't be adjustable. (And, the analog control method is better for the fan, but kicks off more heat from the power transistor itself. PWM solutions run cooler.) As for the transistor next to the CPU, when the fan speed is low, the transistor will have 5V across it, leaving 7V for the fan. At a 200ma current level, the transistor dissipates 5V*0.2A = 1W, and 1W is a reasonable estimate for a safe power limit for an SMT device with 1 sq inch of copper for cooling. The manual gives some higher numbers for this circuit, and the higher numbers might be more appropriate for a PWM fan controller (as a PWM'ed pass transistor is saturated or open circuit, and is controlled with a square wave signal). I suspect the blurb in the manual, about how much current the CPU fan can handle, is a copy-paste error. Disabling QFan would cause the pass transistor to saturate, reducing the voltage drop and the power dissipated, as would setting the fan to a higher speed. The worst condition for the pass transistor is when the fan speed is low. (Stick your finger on it and see how hot it gets :-) HTH, Paul |
#4
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Yes, I had Q-Fan disabled when I tried SpeedFan.
I thought the default manual speed controls in SpeedFan always worked? Daniel Misch wrote: You need to disable Q-Fan in Bios, and in SpeedFan you have to go under the 20% limit to notice a change in noise/rpm... So on... |
#5
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Thanks Paul for taking the time to check this out, and post
your results!!! I guess I just have to accept that once again, have ended up with an ASUS board which has limited or no fan speed control. Your info, at least, means I don't have to keep searching for "better" software. No software will be able to control the other fans. It is interesting that ASUS features (pushes) Q-Fan as a way to greatly reduce the fan noise in a PC. However, just controlling the CPU fan, and NOT the case fans nor the power supply fans will do very little to reduce the overall fan noise. Matter of fact, I bet one can't even tell, noise wise, when JUST the CPU fan is reduced in speed by 20%. Ah, it seems that I have been spoiled by the old P3B-F which allows me to control ALL the fans with SpeedFan. Paul wrote: I only see a transistor around the CPU fan header. (The op amp to drive the transistor could be housed in a quad device elsewhere on the motherboard.) The other fan headers don't seem to have anything like that. Without a power transistor of some sort, it won't be adjustable. (And, the analog control method is better for the fan, but kicks off more heat from the power transistor itself. PWM solutions run cooler.) |
#6
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"Walt" schreef in bericht ... Thanks Paul for taking the time to check this out, and post your results!!! I guess I just have to accept that once again, have ended up with an ASUS board which has limited or no fan speed control. Your info, at least, means I don't have to keep searching for "better" software. No software will be able to control the other fans. It is interesting that ASUS features (pushes) Q-Fan as a way to greatly reduce the fan noise in a PC. However, just controlling the CPU fan, and NOT the case fans nor the power supply fans will do very little to reduce the overall fan noise. Matter of fact, I bet one can't even tell, noise wise, when JUST the CPU fan is reduced in speed by 20%. Ah, it seems that I have been spoiled by the old P3B-F which allows me to control ALL the fans with SpeedFan. Maybe a bit off topic, Walt, but as you are using SpeedFan, do you know if it's possible to control the fanspeed of an Asus Radeon 9600 XT with this piece of software? For the reason of asking you this, please take a look at my other post about Asus Smartdoctor on Win XP Prof. in this NG today. Jan |
#7
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All I can offer, is to suggest check out SpeedFan's website at
http://www.almico.com/speedfan.php BTW, I am using Win XP Pro SP1 too, and had no problem installing SpeedFan. Jan van der Staaij wrote: Maybe a bit off topic, Walt, but as you are using SpeedFan, do you know if it's possible to control the fanspeed of an Asus Radeon 9600 XT with this piece of software? For the reason of asking you this, please take a look at my other post about Asus Smartdoctor on Win XP Prof. in this NG today. |
#8
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"Walt" schreef in bericht ... All I can offer, is to suggest check out SpeedFan's website at http://www.almico.com/speedfan.php BTW, I am using Win XP Pro SP1 too, and had no problem installing SpeedFan. Thanks Walt, I just hoped you could tell me if Speedfan could do the job for the Asus 9600 XT before bothering to install it, because I use a Zalman CPU cooler and a Thermaltake case and the two of them give me the opportunity to control the fans hardwarewise. BTW, my install-problems are not with Speedfan, but with Asus Smartdoctor. Jan |
#9
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#10
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I, too, have only found the manual fan speed controls. I would be very interested in one that worked by sensing temps, and automatically adjusted the fan speeds appropriately. If someone knows of any, please post a reference here! Thanks for verifying that Power Supply (PWR) and the Case (CHA) fan power connectors are, indeed, connected directly to the +12v and thus can't be controlled. Again, I am not real happy with ASUS being so cheap. Plus, ASUS advertises that this MB, with Q-FAN running, can dramatically reduce system fan noise. Without being control the speed of either the Power Supply fan nor the any of the Case fans, it simply can't. Paul wrote: I would have recommended a drive bay fan controller, but with my lousy searching skills, all I've found so far, are the manual style (Nexus) controllers. I thought there was at least one product out there, that has thermistors for controlling case fans. I just recently bought a P4C800E Deluxe (as I'm not interested in LGA775 or PCI Express or processors with large DC leakage currents that waste power not related to computing). I checked with an ohmmeter, and the two other fan headers have their +12V pin connected directly to the +12V pin on the ATX20 pin connector. It would seem there is no controlling device in that path. |
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