Adding a fan to CPU Cooler Help needed

omfgitsrhys

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Aug 25, 2015
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I own a Thermaltake Contac 21 (the cheaper rival to the Hyper Exo 212) which comes with one 92mm fan that is 4 pin PWM with a fan speed from 1000~2400RPM.
My friend gave me an new Arctic 92mm fan ("Rev.2") as he didn't need it and it runs at 550 to 1,800 RPM. It also is also PWM.

The two fans will connect to my motherboard via the two 4pin PWM sockets and will both me attached to the cpu cooler making sure the air is moving from the front of the case to the back.

My question is:
Which fan do i want at the front of the cooler?
Do i want the faster fan at the front pulling more air into the cooler? Or do i want more hot air being drawn from the cooler to the back of the case? As my build is a budget build I don't want to buy anymore fans or anything.

My motherboard is a Msi Z97 Pc Mate. If my cpu is being stressed and getting hot, will my motherboard limit the faster fan to the speed of the arctic fan. Limiting both fans to a max. rpm of 1,800? Or will it simply max out both fans?
Thanks for any help, I know this is a peculiar one!
 
Solution
I would say use the higher RPM fan as intake (pull)
also your motherboard will max out both fans to their own RPM if needed depending on how you have it set in the bios
so your motherboard will turn the rpm up itself when the temp rises

kansei

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I would say use the higher RPM fan as intake (pull)
also your motherboard will max out both fans to their own RPM if needed depending on how you have it set in the bios
so your motherboard will turn the rpm up itself when the temp rises
 
Solution
My guess is that it won't make much difference, however, I would put the faster Thermaltake fan on the front of the heatsink pushing, and the slower Artic fan on the back of the heatsink pulling. By the time the air gets through the restrictive heatsink it will have slowed down anyway. If your UEFI or software allows it, try it both ways with the fans on 100% and measure the temps with HWMonitor or similar. It may be more a function of static pressure than RPM's, so I'm changing my answer to say that you should put the fan with the best static pressure on the front pushing. If you can find specifications for each fan, the static pressure should be listed. Still , the best way to be sure is to test it both ways.
 

omfgitsrhys

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Awesome, Will do man! Cheers!