Maximus V Gene - Fan header 1, low voltage

[adam2104]

Anyone else having trouble with the chassis_fan1 connector? My connector is putting out 3v LESS than the other connectors. For example:

With fan control enabled in the BIOS and set to the "Standard" profile:
chassis_fan1 reads 5v
chassis_fan2 reads 8v
chassis_fan3 reads 8v

With fan control DISABLED in the BIOS, after a reboot:
chassis_fan1 reads 9v
chassis_fan2 reads 12v
chassis_fan3 reads 12v

Because of this my fans are running wonky. Anyone else see this issue? Ideas on how to resolve?

[adam2104]

So, I've done more testing. I think this is maybe a BIOS problem. For the record, I'm running version 0701 on my board. Under normal circumstances the voltages are as I posted in my first post. However the wrinkle comes in when I tried fan xpert2. When using any of the preset "Profiles", i.e. Silent, Standard, or Turbo, the voltage is still 2-3v lower than the other headers. But, if I click the "Full Speed" button at the bottom of fan xpert2 the fans spin up correctly and ALL the headers read 11.99v on my multimeter, includes chassis_fan1. What's up with that? Presumably, based on this information. the header is functioning normally and CAN provide 12v to the fan. The question is why doesn't it do that normally like the other headers?

If someone else with a Gene V could check their board that would be most helpful.

[HiVizMan]

That is a bit odd, were your findings done on BIOS defaults?

[adam2104]

Yes, the BIOS was default. I did tinker with the fan control options in the BIOS as mentioned in my first post to see what happened to the voltage. The only way I can get it to come up to 12v is via fan xpert's "full speed" button. That seems broken to me.

[Shamino]

its prolly as u said a bios bug, ill see if its not fixed in the new bioses

[adam2104]

If you have access the BIOS versions newer than 0701 that would be most helpful. I'm interested to know if your fan header is reading the same voltage level.

[Shamino]

yea there will be an update real soon later , but if u cant wait just use this latest first

http://www.datafilehost.com/download-f42336c9.html

[adam2104]

Shamino wrote:
yea there will be an update real soon later , but if u cant wait just use this latest first

http://www.datafilehost.com/download-f42336c9.html

Thanks for this. Is there a change list on it? Do you know if it fixes this fan issue? Any idea how soon we'll see it posted on the Asus website?

[Spathi]

I have complained about the fans being all screwy 6 months ago for the GENE-Z IV, but they never fixed them.

I think they did some dodgy hack to allow people with old fans in stupid water coolers to use the MB headers as CPU headers.

looks like the V has same hack
http://rog.asus.com/forum/showthread.php?13566-Fan-Xpert-2-bug&country=&status=
Note 50oC on his chassis graph, but the CPU is 50 not the MB

[Spathi]

You may want to check it has not done something unexpected. It is obvious that the CPU header voltage/pulse commands are being directed to some or all chassis fans as well.

What ASUS should do is state that non-PWM fans can not be used with the CPU headers AND add an optional in the BIOS to mess with chassis headers.

What they did is fix it with a hack for people with old crappy fans, but left it all weird for the rest of us.

Mind you it always works fine for me with the CPU temp being in control of chassis header speed, but it would be better for the MB header to be independent of the CPU temp when the PC is idling on a really hot day.

Also, I do not know exactly what is suppose to be, sry, shouldn't they all be 12v pulsed?

Also, someone once reported that changing the fan profile to a certain setting caused the CPU voltage to change, although I never got this to happen maybe it is or was a bug at some stage.. so you may want to test that does not come back with this fix.