how to add aditional fan in chasis if your mobo has only 2?

[odanobunaga]

my chasis is a thermal take v3 black wich can use 4 fans but my motherboard has 2 slot for 4pin fans.
how can i add more fan if that was the case?

 

[lehtv]

What exactly is the motherboard model?

Should be able to use simple 3-pin splitters: http://www.newegg.com/Product/Produc...-063-_-Product

 

[Stuka87]

You can always get a molex/sata to fan header adapter. Or you can get a fan controller to run the other fans and control their speed yourself. Or you can get fan splitters provided the fans aren't super power hungry.

 

[BonzaiDuck]

I argue that you only need two PWM motherboard fan ports for an elegantly simple and effective thermal fan control solution: One for the CPU and exhaust; another for the intake fans. "M-I-B" though. More is better.

A problem may arise if you need three-pin fans. You'd like to have a mobo fan-port for each. Second-best, you could wire those fans in parallel provided total amperage is less than 1.0A. Or, if another poster is correct, there are fan splitters for the 3-pin variety that do the same thing. Most likely, if you NEED 3-pin fans, it would be for air intake. The third-best option (you can argue it's really "second-best") is an auxiliary fan controller -- better if it's provided by the case manufacturer -- better yet if it connects via USB to the motherboard with power from the PSU.

As to the "splitters." Swiftech 8W-PWM-SPL-SAT is marvelous for hooking up to 8 fans and/or pumps to the CPU_FAN port for thermal control, but with power provided directly from the PSU. But all the fans must be PWM fans. If you can meet all your intake fan needs with the PWM variety, you could buy two of the splitters for a total of about $20.

 

[Mantrid-Drone]

The simplest solution is to use an Akasa fan splitter.

http://www.akasa.co.uk/update.php?t...ype_sub=Fan Cable Adapters&model=AK-CBFA04-15

As I understand it because you can't control two PWM fans separately from a single MB fan header one of the connectors is three pin rather than four pin. The fan on that three pin connector, whether a four pin PWM or three pin one, simply runs as slave at the same speed as the fan on the four pin connector whether that it is a four pin PWM conrolled or three pin fan.

In effect with this splitter the two fans are acting as one unit so this makes it a particularly useful solution for twin push/pull fans on CPU coolers or pairs of intake or exhaust fans.

 

[imported_Irse]

You could add a 2 3 pin fan adapter to 4 pin molex

http://www.amazon.com/Molex-Computer.../dp/B00DU8ZZ0O

 

[BonzaiDuck]

The simplest solution is to use an Akasa fan splitter.

http://www.akasa.co.uk/update.php?t...ype_sub=Fan Cable Adapters&model=AK-CBFA04-15

As I understand it because you can't control two PWM fans separately from a single MB fan header one of the connectors is three pin rather than four pin. The fan on that three pin connector, whether a four pin PWM or three pin one, simply runs as slave at the same speed as the fan on the four pin connector whether that it is a four pin PWM conrolled or three pin fan.

In effect with this splitter the two fans are acting as one unit so this makes it a particularly useful solution for twin push/pull fans on CPU coolers or pairs of intake or exhaust fans.

I think that Akasa item is an alternative to the Swiftech device I mentioned. I'm skeptical of any possibility for controlling a PWM and 3-pin fan with it though. It's likely the 3-pin fan would only spin at 100%, no matter what. It would have to have the PWM circuitry common to PWM/4-pin fans.

 

[Mantrid-Drone]

I think that Akasa item is an alternative to the Swiftech device I mentioned. I'm skeptical of any possibility for controlling a PWM and 3-pin fan with it though. It's likely the 3-pin fan would only spin at 100%, no matter what. It would have to have the PWM circuitry common to PWM/4-pin fans.

It is difficult to tell because the BIOS system monitoring info, obviously, only shows fan speed for the unit on the 4 pin lead and, in my case the 'slave' fans on the 3 pin lead are all matching PWM Akasas fans too.

However I've not been able to find reliable information on how the 'slave' fan behaves when using a splitter like this. Can you have two PWM fans sending/receiving PWM signals via one MB header? Wouldn't they conflict and thus make a splitter with two or more functioning 4th pins connections impossible?

So In theory you're right; with the 4th, PWM pin, all you have is power, ground, and sense (tach) and as the 4 pin 'master' fan is being PWM controlled you'd think the full power to the 'slave' would mean it would be at 100% continually. But is it as simple as this?

Maybe it is correct for a 3 pin fan but does a 'slave' 4 pin PWM fan need the 4th pin to be PWM speed controlled? I don't know and the articles I've read about PWM fan control either don't cover this matter specifically and are often beyond my level of understanding anyway.

But what I have observed with my two desktops both of which use one or more of those Akasa x2 splitters the 'slaves' definitely aren't running at 100% all the time. As far as I can tell they do appear to be matching the master 4 pin PWM fan speed.

 

[Smoblikat]

You could:
Use a fan splitter
Use molex
Get a fan controller