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Questions about airflow and fan placement on new build - Page 2

post #11 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Yes, that is fine. The end one is PWM lead and next one is RPM from one fan. thumb.gif

I see.
I assumed that it would be something like this but it's good to make sure. I should have just checked a 4 pin pinout diagram instead of being a noob and posting here.
post #12 of 21
Thread Starter 
So I seem to be having an issue where if a single fan is plugged into the motherboard header I get to control fan speed in BIOS but if I use the splitter to control 2 fans they both run at full speed and I get no control in BIOS.
post #13 of 21
Quote:
Originally Posted by Crazyegg View Post

So I seem to be having an issue where if a single fan is plugged into the motherboard header I get to control fan speed in BIOS but if I use the splitter to control 2 fans they both run at full speed and I get no control in BIOS.
Sounds like your header is supplying variable voltage control, not PWM control. Most motherboards only have PWM control on their CPU fan header. I would check and see that the header you are using is really a PWM header and is set to PWM control. Sometimes that has to be set in bios to PWM to get PWM control. Other fan headers may be 4-pin but the 4tth pin does nothing.
Edited by doyll - 2/27/16 at 12:13pm
post #14 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Sounds like your header is supplying variable voltage control, not PWM control. Most motherboards only have PWM control on their CPU fan header. I would check and see that the header you are using is really a PWM header and is set to PWM control. Sometimes that has to be set in bios to PWM to get PWM control. Other fan headers may be 4-pin but the 4tth pin does nothing.

The motherboard is a basic MSI B85 board so that header might not be PWM. Would it be ok to install the splitter on the cpu header and have my cpu fan (using the stock cooler) and case fans all powered by molex?

I don't remember seeing anything about pwm in the BIOS but I'll try and get a picture of it in a little while.
post #15 of 21
Quote:
Originally Posted by Crazyegg View Post

The motherboard is a basic MSI B85 board so that header might not be PWM. Would it be ok to install the splitter on the cpu header and have my cpu fan (using the stock cooler) and case fans all powered by molex?

I don't remember seeing anything about pwm in the BIOS but I'll try and get a picture of it in a little while.
Yes, that should work just fine. Most all of my systems (all use PWM fans for everything) use CPU fan header to control them. wink.gif
post #16 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

Yes, that should work just fine. Most all of my systems (all use PWM fans for everything) use CPU fan header to control them. wink.gif

Everything has been sorted now.
I connected the 2 side fans + cpu fan to the cpu header and the rear 3 pin 90mm exhaust to the variable voltage control header and slowed it right down. The pc is now pretty quiet (I'm in the UK and the idle temps for the 4460 is between 16-20C on HWMonitor).

The only thing that's making a bit of noise is the front molex powered fan which came with the case, it's not really too much of a bother but I might replace that with a pwm alternative.
post #17 of 21
Quote:
Originally Posted by Crazyegg View Post

Everything has been sorted now.
I connected the 2 side fans + cpu fan to the cpu header and the rear 3 pin 90mm exhaust to the variable voltage control header and slowed it right down. The pc is now pretty quiet (I'm in the UK and the idle temps for the 4460 is between 16-20C on HWMonitor).

The only thing that's making a bit of noise is the front molex powered fan which came with the case, it's not really too much of a bother but I might replace that with a pwm alternative.
I'm going to say I don't believe 16-20c idle temps .. unless you are in a 10-15c room. That's colder than my outside temp .. and I'm in the UK tool tongue.gif
South Coast
post #18 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

I'm going to say I don't believe 16-20c idle temps .. unless you are in a 10-15c room. That's colder than my outside temp .. and I'm in the UK tool tongue.gif
South Coast

That's what HWMonitor gives me, though when I'm in BIOS the temperature starts low and maxes out at 30C but I remember reading that when in BIOS the cpu may not be idle. I was quite surprised about the temperature as well, especially because I'm using the stock cooler. Could the program be wrong? (I'll try and get a screenshot)

I'm in London where the temperature has probably been less than 10C and I'm a weirdo who likes the cold so my windows are still open..

I'll run AIDA64 and see how the temperature changes.
post #19 of 21
Quote:
Originally Posted by Crazyegg View Post

That's what HWMonitor gives me, though when I'm in BIOS the temperature starts low and maxes out at 30C but I remember reading that when in BIOS the cpu may not be idle. I was quite surprised about the temperature as well, especially because I'm using the stock cooler. Could the program be wrong? (I'll try and get a screenshot)

I'm in London where the temperature has probably been less than 10C and I'm a weirdo who likes the cold so my windows are still open..

I'll run AIDA64 and see how the temperature changes.
They may be more accurate than I think. Doesn't really matter as load temps are what's critical.
The built in temperature monitors are know to be inaccurate at lower temperatures, and become much more accurate at temps above50-60c and above
post #20 of 21
Thread Starter 
Quote:
Originally Posted by doyll View Post

They may be more accurate than I think. Doesn't really matter as load temps are what's critical.
The built in temperature monitors are know to be inaccurate at lower temperatures, and become much more accurate at temps above50-60c and above



This screenshot is after AIDA64 ran for 15 minutes and a 5 minute cool-down period. One core peaked at 51C but most of the time, all the cores were under 50C.

I've not done any gpu testing as I haven't installed the drivers yet and the fans don't even turn on until the temperature reaches 60C.
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