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Will the P67 Sabertooth boot if you don't have a CPU_Fan plugged in?

Last response: in Motherboards
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January 30, 2013 9:36:15 PM

I was really hoping that it would still let you boot up if you don't have something plugged into the CPU_Fan socket. I just got an aerocool shark 140mm fan and it's a 3 pin fan that comes with a molex adaptor. This would be fine (i'm an idiot for not reading the fact it didn't say PWM anywhere) but can I plug it straight into the PSU rather than the motherboard?
a b Ĉ ASUS
a c 97 à CPUs
a c 104 V Motherboard
January 30, 2013 9:38:44 PM

Yes, you may get an error during post but you should be able to disable the cpu fan detection in bios.
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January 30, 2013 11:07:00 PM

Sorry, second point, will the motherboard fan header be able to control fan speeds on a 3 pin fan through hardware PWM?
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a b Ĉ ASUS
a c 97 à CPUs
a c 104 V Motherboard
January 30, 2013 11:08:53 PM

I believe so.
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January 31, 2013 12:15:03 AM

Guess I'll have to find out and see XD. I'm not sure if I have Q-Fan enabled, as my current 3 pin fan is always at 100% on my CPU.
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a b à CPUs
a b V Motherboard
January 31, 2013 12:18:16 AM

OpalReactor said:
Sorry, second point, will the motherboard fan header be able to control fan speeds on a 3 pin fan through hardware PWM?


No. You need a four pin.
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January 31, 2013 12:36:31 AM

samuelspark said:
No. You need a four pin.


Bugger, I'll just connect my CPU fan to the 3 pin Chassis fan I guess =\ but controlling speeds might get a little interesting, as there won't be a direct between fan speed and CPU temperature.

Or would it be better to just run MOLEX 4P off the PSU?
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Best solution

a b à CPUs
a b V Motherboard
January 31, 2013 1:10:49 AM

OpalReactor said:
Bugger, I'll just connect my CPU fan to the 3 pin Chassis fan I guess =\ but controlling speeds might get a little interesting, as there won't be a direct between fan speed and CPU temperature.

Or would it be better to just run MOLEX 4P off the PSU?


3 pins work in 4 pins. You just don't get that PWM. Don't run it on molex unless you have to.

Also, you should have no problems with running without anything connected to CPU fan header. Both my motherboards that I've used have been fine with that.
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January 31, 2013 1:20:24 AM

Ah! I just remembered, I'm such an idiot, my NZXT phantom comes with it's own fan controller.

And with my current 3 pin fan, I'll just attach it to the side of the case and plug it into a CHA_Fan port.
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January 31, 2013 1:36:14 AM

Best answer selected by Opalreactor.
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