- Nov 25, 2011
- 54
- 0
- 18,630
This is a prime example of bad advertising:
http://forum.corsair.com/v3/showthread.php?p=710824
The headers on these latest motherboards are not PWM despite having four pins. They actually use voltage (as I am sure most of you are already aware) to control RPM instead. Most fans have a lower bound voltage tolerance on spin up of somewhere between 30%~40%
With default settings they certainly won't start up from a cold boot as the temps would not be high enough to warrant a 30%~40% ramp up. Only after some time operating would temps get high enough to signal an increase thus starting the fans.
This is a configuration issue at the end of the day. Rectified by setting the base tolerance to just enough to kick the fan off in both BIOS & any software that supersedes at the OS level.
I don't think there's nearly enough documentation on modern fan control methodology to be honest. Certainly the advertising glosses over the fact that MB headers are actually voltage regulated. There's only two true PWM signal headers on the boards; the main CPU fan header and the CPU OPT header.
Indeed one could well plug in a splitter and daisy chain the PWM signal around their case. However doing so only gives you PWM in the context of the CPU and NOT the individual temperature sensors located around the board. So in that respect it ends up being totally pointless and even detrimental for case fans; imagine the scenario where the GPU or the chip set gets hot ahead of the CPU. Basically your context is not globally considerate.
Yes fan speed control is argued to not matter with case fans. I disagree, we have a feature-set there, why not take advantage of it. Personally I can't be bothered to use a control unit as I'd prefer for the software to do what it's been designed for therefore saving me flicking switches and groping knobs all the time.
http://forum.corsair.com/v3/showthread.php?p=710824
The headers on these latest motherboards are not PWM despite having four pins. They actually use voltage (as I am sure most of you are already aware) to control RPM instead. Most fans have a lower bound voltage tolerance on spin up of somewhere between 30%~40%
With default settings they certainly won't start up from a cold boot as the temps would not be high enough to warrant a 30%~40% ramp up. Only after some time operating would temps get high enough to signal an increase thus starting the fans.
This is a configuration issue at the end of the day. Rectified by setting the base tolerance to just enough to kick the fan off in both BIOS & any software that supersedes at the OS level.
I don't think there's nearly enough documentation on modern fan control methodology to be honest. Certainly the advertising glosses over the fact that MB headers are actually voltage regulated. There's only two true PWM signal headers on the boards; the main CPU fan header and the CPU OPT header.
Indeed one could well plug in a splitter and daisy chain the PWM signal around their case. However doing so only gives you PWM in the context of the CPU and NOT the individual temperature sensors located around the board. So in that respect it ends up being totally pointless and even detrimental for case fans; imagine the scenario where the GPU or the chip set gets hot ahead of the CPU. Basically your context is not globally considerate.
Yes fan speed control is argued to not matter with case fans. I disagree, we have a feature-set there, why not take advantage of it. Personally I can't be bothered to use a control unit as I'd prefer for the software to do what it's been designed for therefore saving me flicking switches and groping knobs all the time.
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