[SOLVED] How should I fit 7 fans in my case?

[Terminasitor]

I have a Corsair R275 airflow case with four fans -three in the front and one in the back- creating positive airflow. However due to high CPU temps I think I will upgrade my air cooler to a 360mm aio and although it fits in my case I don't know how to configure my fans. I have crated three sketches to help me visualize the airflow, can you tell which is most appropriate? (Please excuse my rough ms paint skills )

https://imgur.com/6lyT9xL

View: https://imgur.com/6lyT9xL

 

[rgd1101]

1) aio out on the top

 

[Terminasitor]

1) aio out on the top

Thanks for your answer, that looks like the most sane config for me too.
But is this not a negative pressure configuration? I'm worried about dust buildup.

 

[rgd1101]

the only way to not have dust is to run it in a clean room

 

[Terminasitor]

the only way to not have dust is to run it in a clean room

I guess that's right

 

[rgd1101]

most you can do is add filter in the front. but air do move from any opening

 

[geofelt]

Positive pressure air cleaning comes from having all incoming air be at one source and filtered.
To cool a cpu best, arrange for the radiator to get fresh air.
That would suggest a front mounted intake radiator would address both of your objectives.
The only extra fan I would use would be a weak rear exhaust fan. That will direct airflow over the motherboard and graphics card.

If you use exhaust fans that are strong, they will tend to draw in unfiltered air from adjacent openings. All the air coming in the front will exit SOMEWHERE, taking component heat with it.

 

[Phaaze88]

Do #2, but do not install a fan at the rear - just a filter.

 

[Paperdoc]

Different advice again, just to add to your stress. Use arrangement #1 with INTAKES at the front. Put your AIO rad there to use slightly cooler room air, and ensure there is a dust filter system on the outside (room) side. But make one other change.

When you arrange that way, at the top front corner the air intake from top fan in the front panel gets short-circuited right out of the front fan of the top panel group. Further, the front AIO rad intake system slightly reduces the air intake by those fans, so the four exhaust fans cause an unbalance and you will get small negative pressure. Simply do NOT install the front fan in the top panel group - this leaves you with 6 fans total. There will be no short-circuit air flow, and the air balance will be better. IF you detect small negative pressure in the case in this configuration that can be adjusted with a custom "fan curve" to slow down the three exhaust fans. HOW to detect and fix that? Post back here if you need details.