Mobo/BIOS doesn't see PWM hub

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therealnps

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Feb 21, 2015
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Hi, I have a Be Quiet! Dark Base Pro 900 PC case (which has a PWM hub) and an MSI X99A SLI PLUS mobo. The hub has a "4-Pin PWM Connector to M/B" which I tried to connect to both CPUFAN1 and SYSFAN1 (not simultaneously, obviously :p). But in both cases the mobo/bios doesn't see it being connected (my UEFI has a "Hardware explorer" or sth like that and it shows me all devices connected to all ports on mobo). The fans spin but I cannot control that speed (since they're not seen). When I try plugging any of the case fans (which are now connected to the PWM hub) to a SYSFAN1 the mobo/bios sees it and I can control it.

Did I do something wrong? How can I make my mobo/bios see the hub and control the fans connected to it?
 
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maugusto

maugusto

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Jan 2, 2016
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like the same says (PWM HUB) the motherboard will see only one PWM "FAN" not 4 or 8 individual fans you only will be able to controll one speed and that speed is for the PWM 1 on the HUB, and all the other PWM connectors will have the same speed
unless the PWM hub have a USB connector for software management
 
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therealnps

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Feb 21, 2015
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Yeah, I know I can't control the speeds of each fan separately. But what do you mean with PWM 1 on the HUB? That I will be able to control the fan connected to the first port on the hub and the others will have a static non-controllable speed? I think the whole point of hub is to be able to set the same speed for all of fans (and I even think the PC case's manual says something of the sorts).
 
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maugusto

maugusto

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plut one fan in the PWM1 (or FAN1) port of the hub, then plug the hub on a PWM connector on the motherboard, and on the bios you shoud be able to see a fan on that PWM connector on the motherboard.
 
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therealnps

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Feb 21, 2015
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Just tried that and unfortunately it didn't work. Actually, my hub has ports FAN1 - FAN4 for 3-pin fans and FAN5 - FAN8 for 4-pin fans. So I tried connecting the single fan to both FAN1 and FAN5 but in both cases the hub wasn't detected in bios. Also - by "PWM connector on the motherboard" you mean SYSFAN1 (4-pin port for attaching fan)?
 
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therealnps

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Feb 21, 2015
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Automatic. This case has a slider which has 2 modes:
- when it's slided maximally to the left - it's automatic
- otherwise it's controlling the speed manually (btw this works nicely)
But I should be able to change between automatic and manual so I'm pretty sure the mobo should detect the hub regardless of the slider's position.
 
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therealnps

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Feb 21, 2015
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Ken_53, you mean you also have a Dark Base Pro 900 case? If so then either it's a coincidence or my case isn't faulty after all (which would actually make me feel better). But that still leaves us with the question - why isn't it working?
 
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Ken_53

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I have tried again to plug in to CPU fan hub and it works now. System fan hub has no Pwm function.



 
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therealnps

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Feb 21, 2015
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To clarify, you mean that you tried connecting your PC case's hub to a SYSFAN port on your mobo which didn't work but when you connected it to a CPUFAN port it worked, yes? I'll check that on my mobo first thing when I get home today.
 
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