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I have an Asus P4T533 motherboard. Whenever the computer starts, the M/B checks the rpms on the CPU fan and if it's not at least 2200 rpm, the computer issues a warning and hangs the startup sequence.
Does anyone know how to get rid of, override, or fool this safety check? I have Zalman heatsink and fans in my computer and they would work fine at half the rpms I'm forced to run them at. (I'm trying to keep my computer quiet.) Water cooling people must deal with this all the time, since there's no fans in a watercooled case. Any suggestion would be appreciated!
Bill
In the BIOS there should be a screen called something like 'PC Health Status' where it displays the tempertures/voltages/and rpms. You can select to ignore the CPU fan.
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I've been through every screen and every option in the BIOS. Believe me, there's no way to disable it from the BIOS.
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I had a board that did the same thing and like yours had no way to disable it. Here are two solutions.
If you are using very low speed 12v fans then just splice together their same-colored wires (black with black, red with red, etc) so that two fans are now sharing one 3-pin power connector on the mobo. They will each still get 12v but their current draw is now doubled and the board will think it is one fan running at double its normal low speed.
If you are using normal fans and are slowing them down with a fan controller of some sort, just connect them in series so that the mobo will think they are one fan running at a full 12v but in actuality are two fans running at 6v each. To do this you take one fan's 3-pin connector, cut off the black wire 2 inches above the connector and connect that to the other fan's red wire, then connect that second fan's black wire back to the stub from the first fan's black wire.
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Johnoh,
Thanks, that was just the kind of information I was looking for. I'm thinking I might just as well attach the CPU fan to some output on the PSU (so the M/B can't monitor it) and then put something on the end of the leads to the M/B to fool it into thinking it has a fan on it. Do you think a resistor would work?
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Yes a resistor worked for me (I tried that first). If you figure 2W-3W or so for a high speed 60mm fan running across 12v that's 166mA-250mA. v=ir so r= 12v/.166 or 12v/.250 or r = 72ohms or 48ohms. I think you can get a 50ohm 5W resistor at radio shack for $1.50 or so which is what I got.
You'll have an annoyance of heat here and the problem of where do you put the resistor. If you put it right next to the power header the heat makes a difference. Maybe connect wires to it and epoxy it to the case wall so the case becomes a heatsink. Just make sure to shield any exposed metal so you don't end up shorting it against something.
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I have an ASUS P4PE motherboard and there is a setting to ignore the cpu fan. I had to do the same thing only for my power fan. I should be found under 'Power' and then 'Hardware Monitor'. You will see a CPU Fan Speed listed there (it may be in red if your motherboard thinks its too low). just simple press enter on that to chnge the setting to ignore. hope this helps
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 360w enough for 3.2ghz???
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333mhz FSB running on 200...
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