New build - Fan issues

alldaye

alldaye

alldaye

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Joined
6 Oct 2013
Posts
34
Hi people,

Ok I have a weird problem that I can't seem to figure out.

I have just done a part build system. Cpu, heatsink, mobo, ram.

Right so the new heatsink works perfectly....keeping an AMD FX-8350 at 10/11c on idle and the max I have seen on stress testing 42c. Even overclocked to 4.5ghz it only went to 45c. This heatsink is the http://www.overclockers.co.uk/showproduct.php?prodid=HS-080-AK&groupid=701&catid=2330

To my main issue. So I am using an Asus M5A97 EVO R2.0 motherboard. http://www.overclockers.co.uk/showproduct.php?prodid=MB-502-AS&groupid=701&catid=1903&subcat=2046 This has 1cpu header and 3 chassis headers. All 4pin. The cpu fans perfectly using the supplied splitter.

The issue I am having is that I am running 3 x http://www.overclockers.co.uk/showproduct.php?prodid=FG-057-AK&groupid=701&catid=2331

1 as an exhaust and 2 using a http://www.overclockers.co.uk/showproduct.php?prodid=CB-071-AK
(the same cable that is supplied to run the 2x cpu fans) to run as intakes on the front of a Corsair 400r case.

Now the problem is on startup, the cpu fans start ok, but the chassis fans don't. They sit there and just rock every 2/3 seconds. If I give them a little nudge they start to spin, but very slowly. In the bios, they don't register unless I force them to start. I have the q-fan setting at a minimum of 600rpm? But even when I do force them, they register at 300ish rpm. And the fans that are monitored don't match the header numbering on the mobo. Such as I have the rear one in chassis fan 1 and registers as 2? Weird.

But if I do a stress test, the fans eventually start on their own once the temperature gets up above a certain point inside the case.

But I want them to start all the time to keep the case cooler from the word go rather than wait until it reaches a certain temperature then start.

So these are my thoughts, the Mobo isn't starting the Akasa Black Apache with enough power to start them spinning? Even though the motherboard is set to 600rpm? Which is the fans minimum quoted rpm. Even though if I flick them they register 300ish.

I will try with the corsair fans that came with the case to see what results I get. These are 3 pins where the Akasa are 4pin PWM fans.

Any advice is welcomed, but please don't just recommend a fan controller as I don't to have to control them myself, I want the mobo to do the job its supposed to do itself.

Thanks.

Ed
 
I haven't installed the software. I wanted the bios to do the stuff.

Tell me, once windows has started up, does Fan Xpert take over?
 
I assume you installed the fan correctly, as in, you made sure the little plastic bit extending from just above the 3-pin header slid in between the two small lines of plastic on the fan cable?
 
Yep i have. As I said, the 3 pin fan works fine from boot. Its the 4 pin PWN fans that don't seem to have enough ooopfff to get going straight away yet the bios low limit is 600rpm.
 
Hmmmmm...I'm kind of convinced that it's a hardware problem, without it in front of me however I can't tell.

Try plugging a CPU fan into one of the chassis headers and one of the chassis fans into the CPU header and starting it up.
 
Good idea, I will do that and get back to you.

Also to point out....the akasa fans....2 are a year old and I brought a new one with the upgrade. They are all experiencing same problems.
 
Ok, well MTBF for most fans are usually at least 10,000 hours as an ABSOLUTE minimum, in fact even the cheapest fans are double that. :D

That's not to say they haven't failed but all 3 at once seems a bit odd, especially when one is basically brand new. :/
 
They do work....as I stated, just not when the case is cool. Its like the motherboard doesn't give out enough current to spin them until it gets warm and they get more current.

I will try the cpu header though and update.
 
Odd, sounded so much like a hardware issue? :D

Yeah, keep an eye on that. I imagine it will be fine, but just in case. ;)

Glad you got it sorted. :)
 
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