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post #11 of 14
Quote:
Originally Posted by RVJ22 View Post

All good there...case fans are MB controlled and right now I have 2 intake / 1 exhaust. If I add a bottom fan I'll have 3 intake so I should always have positive pressure.


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Should work. Just remember that if GPU fans speed up and case fans do not, airflow may be drawn air in through the open PCIe slots by the GPU fan closest to them. I've seen this happen even with case fans speeding up. Reason is simply the 'path of least resistance'. The back slots are so close to the back GPU fan it is easier to pull air from them than from intake fans in front and bottom of case. This is compounded by the PSU housing and the other GPU fans taking part of the airflow. If air is pulled in the PCIe slots when GPU is working hard, it's not a big deal. It's easy to make a filter to fit them. Simple thin pot scrubbers work great. Just cut to size and fit into slots.

If you don't have any, your local Cheap Shop / Dollar Store probably does.
post #12 of 14
Thread Starter 
Thanks for the advice...these changes are my weekend project. Took a look and I should have no problems adding a middle, bottom 140mm intake. Since all the fans can be controlled independently by the MB would you tie all the case fans (3x intake and 1x exhaust) to both the CPU and GPU temps or split the intakes with bottom tied to GPU and 2x front tied to CPU? The MB will let me map each fan to up to 3 sensors independently.

Something else that you made me realize is that my case placement my be contributing to GPU heat. My case is under my desk and there is a privacy screen that comes about half way down. Given the open rear vents on the R5 and what you said about the path of least resistance, it is highly probable that the rear GPU fan is pulling warm air in from the back of the case before it can dissipate. I'll be moving the PC to the side of the desk as well.

Looking forward to seeing how much improvement I get. Let me know if you have any other thoughts / ideas.


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post #13 of 14
Quote:
Originally Posted by RVJ22 View Post

Thanks for the advice...these changes are my weekend project. Took a look and I should have no problems adding a middle, bottom 140mm intake. Since all the fans can be controlled independently by the MB would you tie all the case fans (3x intake and 1x exhaust) to both the CPU and GPU temps or split the intakes with bottom tied to GPU and 2x front tied to CPU? The MB will let me map each fan to up to 3 sensors independently.

Something else that you made me realize is that my case placement my be contributing to GPU heat. My case is under my desk and there is a privacy screen that comes about half way down. Given the open rear vents on the R5 and what you said about the path of least resistance, it is highly probable that the rear GPU fan is pulling warm air in from the back of the case before it can dissipate. I'll be moving the PC to the side of the desk as well.

Looking forward to seeing how much improvement I get. Let me know if you have any other thoughts / ideas.


Sent from my iPhone using Tapatalk
Case fan control is hard to guess what will give lowest temps. Best is to experiment and see. If header uses highest of CPU & GPU temp to determine fan speed, it probably makes no difference in cooling, but might make a difference in noise level.

Bottom fan will work better if case is raised up on about 30mm blocks under it's feet.

2nd postin "Ways to Better Cooling" shows how I monitor case airflow and cooler intake air temps when optimizing case airflow. You can use incense stick smoke to see if vent is flowing air in or out. wink.gif

Airflow is a fickled witch and often does the unexpected. There are so many variables involved, it is usually easier to figure out why it is what it is after it does something we didn't think would happen. wink.gif
post #14 of 14
My side fan as exaust throw 50-60 degree air outside, like a heater biggrin.gif peeps should consider that and not under rate it.
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