Fan Header Issue

[LiquidFlame]

Last night when I was messing around with my rig, I noticed that one of my fans wasn't running right. At startup it would run fine, but after 30sec or so before windows would load, the fan would just stop. I had it plugged into the chassis fan #1 and at first I thought that the fan might have died. So I plugged the fan into chassis fan #2 and it worked fine, so I knew it wasn’t the fan. I started to worry that I might have actually shorted out the chassis fan #1 header, so I tested another fan on that header and the same result. I then decided to go into the BIOS and look at the fans settings thinking it might have something to do with that. I changed the “Chassis Fan” setting to manual, which made the chassis fans run at 100%. I restarted the computer and bingo the fan that is hooked up to chassis fan #1 works fine, so I figured it was the setting in the BIOS. My question is, is this really an issue, I know I should probably not have it running on 100%, but I just don’t understand why the chassis fan #1 doesn’t run when in the BIOS it’s set to SmartFan. Also I had question about the AUX fan header. Right now my 8800GTX blocks it from view, I am able to hook up a fan to it, but I was wondering if any one new if the 8800GTX sits right on top of it or not. It looks like a tight fit and I want to make sure nothing is getting cracked or bent. Any help would be great. Thanks for the advice in advanced.

 

[tdank]

Personally I set all my fans to run at a minimum of 80% constantly and 100% if things get even mildly warm. Yes I will burn through fans quicker but they are cheap to replace vs. fried hardware. Running it at 100% shouldnt give you any issues.

 

[LiquidFlame]

By the way I have a 680i, but I just find it wired that under the SmartFan in the BIOS the fan doesn't work on the chassis fan #1, but does on chassis fan #2 and as far as I can tell under the SmartFan, both are controlled be the same setting. Does this sound like there's something wrong with my board?

 

[tdank]

Could be, but I would suspect its bios related not hardware malfunction/damage. If the system is running stable and you arent experiencing any other issues, youre probably goo. You could try updating the bios if you are really concerned about it.

 

[LiquidFlame]

BIOS is up to date, some one in another forum said it sounded like a classic fan undervolt. When I get home from work, I'm going to try and reproduce it under the manual settings to see what's going on.

 

[DAC21]

Possibly some voltage fluctuations to #1 is causing under volts to the fans. Do they make a splitter to run off #2 so both fans can run in smart mode?