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2 Intake + 1 Exhaust or 3 Intake + 2 Exhaust?

VWood
By VWood
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Posted

Hi,

I have a case that has space for 2 fans in the front, 1 in the back and 2 on top.

Currently I am running with 2 intakes in the front and 1 exhaust in the back.

 

Would it be a good idea to change it to 2 intakes in the front, 1 intake in the back and 2 exhaust on top?

Does such a setup make a difference to temperatures, especially with the rear fan blowing cold air directly onto the CPU?

Obviously I want good airflow so, would the front and rear intake setup cause turbulence inside the case?

 

I also have two other questions:

1. I have a Gaming M3 b150 motheboard which supports 3 system fans and 2 CPU fans, which means that, if I go with the 3 intake, 2 exhaust option, I would need more fans than the motherboard can support. How do I add extra fans in such a way that I can control their speed?

2. All the fan slots on the Motherboard are PWM and all my fans are 3 Pin. How do I control their speed? Will SpeedFan work?

 

Thank you for everyone's responses to my other questions so far, I haven't had time to respond and I don't want to resurrect old posts.

 

Edit:

Thank you for all the replies and advice.

I think I will stick to my current setup of 2 front intake and 1 rear exhaust and will focus on installing stronger fans rather than more fans.

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Posted
4 minutes ago, VWood said:

Hi,

I have a case that has space for 2 fans in the front, 1 in the back and 2 on top.

Currently I am running with 2 intakes in the front and 1 exhaust in the back.

 

Would it be a good idea to change it to 2 intakes in the front, 1 intake in the back and 2 exhaust on top?

Does such a setup make a difference to temperatures, especially with the rear fan blowing cold air directly onto the CPU?

Obviously I want good airflow so, would the front and rear intake setup cause turbulence inside the case?

 

I also have two other questions:

1. I have a Gaming M3 b150 motheboard which supports 3 system fans and 2 CPU fans, which means that, if I go with the 3 intake, 2 exhaust option, I would need more fans than the motherboard can support. How do I add extra fans in such a way that I can control their speed?

2. All the fan slots on the Motherboard are PWM and all my fans are 3 Pin. How do I control their speed? Will SpeedFan work?

 

Thank you for everyone's responses to my other questions so far, I haven't had time to respond and I don't want to resurrect old posts.

It won't change much or really nothing. It might also perform worse as the back exhaust can help blowing away the heat from your GPU.

 

1. You can buy splitters. Plug a splitter female to the motherboard and 2x males to your fans. It will support it without problem.

2. You can use motherboard temperature signals to control them. PWM in my opinion is a better choice but you can still control 3-pins fans by the bios, usually.

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38 minutes ago, VWood said:

Hi,

I have a case that has space for 2 fans in the front, 1 in the back and 2 on top.

Currently I am running with 2 intakes in the front and 1 exhaust in the back.

 

Would it be a good idea to change it to 2 intakes in the front, 1 intake in the back and 2 exhaust on top?

Does such a setup make a difference to temperatures, especially with the rear fan blowing cold air directly onto the CPU?

Obviously I want good airflow so, would the front and rear intake setup cause turbulence inside the case?

 

I also have two other questions:

1. I have a Gaming M3 b150 motheboard which supports 3 system fans and 2 CPU fans, which means that, if I go with the 3 intake, 2 exhaust option, I would need more fans than the motherboard can support. How do I add extra fans in such a way that I can control their speed?

2. All the fan slots on the Motherboard are PWM and all my fans are 3 Pin. How do I control their speed? Will SpeedFan work?

 

Thank you for everyone's responses to my other questions so far, I haven't had time to respond and I don't want to resurrect old posts.

3 intake, 1 exhaust

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I'd say maybe throw in a fan above your cpu as exhaust if you're going to add a fan, otherwise stick with your current setup

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On 9/25/2017 at 12:17 PM, VWood said:

Would it be a good idea to change it to 2 intakes in the front, 1 intake in the back and 2 exhaust on top?

 

I don't see much point in that unless you have top mounted AIO.

 

On 9/25/2017 at 12:17 PM, VWood said:

Does such a setup make a difference to temperatures, especially with the rear fan blowing cold air directly onto the CPU?

 

Depends on what CPU cooler and where its exhausting. Probably drops temps sub-5C.

 

On 9/25/2017 at 12:17 PM, VWood said:

Obviously I want good airflow so, would the front and rear intake setup cause turbulence inside the case?

 

Nope. Case fans aren't that powerful that their effect would last more than 10-15cm from blades. You can check some smoke visualizations to see what I mean by that. Rear fans airflow would be immediately sucked by top fans anyway while front fans would circulate air for both CPU and GPU (for some reason this fact is often forgotten when ppl ask about general airflow).

 

On 9/25/2017 at 12:17 PM, VWood said:

1. I have a Gaming M3 b150 motheboard which supports 3 system fans and 2 CPU fans, which means that, if I go with the 3 intake, 2 exhaust option, I would need more fans than the motherboard can support. How do I add extra fans in such a way that I can control their speed?

 

Like said, splitters. Ofc with splitter both fans will follow same speed setting. So, if you can, same fans per splitter.

 

On 9/25/2017 at 12:17 PM, VWood said:

2. All the fan slots on the Motherboard are PWM and all my fans are 3 Pin. How do I control their speed? Will SpeedFan work?

 

Depends bit on mobo. Some have setting to select between PWM and DC for header controls. Also you can just use mobos own software. Or speedfan. But first header needs to be told what style fan is used. If there's setting for it.

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  • Author

Thank you for the replies and advice.

I think I will stick to my current setup of 2 front intake and 1 rear exhaust and will focus on installing stronger fans rather than more fans.

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