How much does RPM matter when choosing a CPU cooler fan?

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Rangan Das

Rangan Das

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Apr 28, 2013
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The stock fan on my Cooler Master CPU cooler (Hyper TX3 Evo) just died. The stock fan would go around 2400 RPM on full load. I found a couple of Arctic Fans on Amazon which offer lower RPMs. Here are the links to Amazon India.

Now, given that the TX3 Evo is just borderline sufficient to keep my FX-8320 (OCed) cool enough, will the new fans, in any way improve/degrade the cooling performance?

The CPU diode temps, during winter with ambient temps between (8-16deg C), hover around (60deg C) under full load. During summer when ambient temps are around 35deg C, the CPU temp would go near 75deg C.
[using AIDA64 to stress test and get readings]

So, will these fans suffice?


 
Solution
Darkbreeze
Turn those fans around. You are just blowing hot air back down on to your components. You will see a greater increase in cooling performance if front, bottom and side fans are intake, and top or rear fans configured as exhaust.

Cooling performance is also maximized when there are more exhaust fans than intake, a classic negative pressure configuration.

Basically, like this. This is the standard arrangement that has been proven to be most effective for 99% of modern desktop tower configurations.


2008izm.jpg
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krzyimprt

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Depends if you want it quite or not. Fans won't really change the temps much. Going for a beefier cooler will allow for lower RPM fans but lower temps.
 
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Darkbreeze

Darkbreeze

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Those fans have lower CFM and lower static pressure than the factory TX3 fan, performance will be worse than with the stock fan.

While these are definitely more expensive than those Arctic fans, you will at least not LOSE any performance. This is the RIGHT fan to put on that cooler.

https://www.amazon.in/Cooler-Master-BladeMaster-Silent-R4-BM9S-28PK-R0/dp/B0034AFDL4/ref=sr_1_1?s=computers&ie=UTF8&qid=1516084344&sr=1-1&keywords=R4-BM9S-28PK-R0


Or, you can go with a good 92mm fan that has at least 3mm H2O static pressure and at least 48CFM airflow.

Since your temps are already somewhat high in the summer, it might be a much better idea to simply step up to a better 120mm heatsink fan cooler that will offer improved performance over that small 92mm model.
 
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Darkbreeze

Darkbreeze

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Nonsense. Different fans have a HUGE impact on whether performance is worse, same or better than what the unit had originally.
 
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krzyimprt

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Bruh, he's using a TX3 to cool an overclocked 8350 which has gaps between the heat pipes. Changing the fans won't do any good unless he want's it to be loud.
 
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Rangan Das

Rangan Das

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It's an 8320. The OC is very small. I used the mobo utilities (Asus AI Suite 2) that gave me a bump to 3.8GHz from the stock 3.5. It occasionally goes to 4.2, but even when playing Ghost Recon Wildlands, the CPU stays at 2.8 - 3.2 GHz.
 
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Darkbreeze

Darkbreeze

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I didn't say the cooler was a great one, "bruh". I said fans make a difference. A mediocre cooler CAN be improved by using a higher performance fan with more CFM and static pressure than the original one. I test fans and cooling equipment, many of them, so I might have a clue what I'm talking about.

I also said moving up to a larger 120mm cooler was probably a good idea, but regardless, using the same fan or a better one IS an option. Just not a good one. 75°C during the summer is already past what that CPU is supposed to run at max. 68-70°C is TJmax for all AMD FX Bulldozer and Piledriver processors, so 75°C is actually already overheating.

I did however miss that he said it was overclocked, so on that you are right. Need to take the overclock OFF or get a bigger cooler. No way in hell ANY FX processor should be overclocked using a 92mm cooler in the first place. Would be much better off with a Gammaxx 400 or Cryorig H7 as far as budget options are concerned. Even a Hyper 212 would be better, but all the Cooler Master CPU coolers are somewhat bottom of the barrel when it comes to aftermarket cooling performance. The Deepcool Gammaxx 400 and Cryorig H7 blow doors on the 120mm Cooler Master units.

Better still would be putting some kind of 140mm cooler on there. Any overclocked FX chip really should have at least a single fin stack 140mm CPU cooler.
 
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Rangan Das

Rangan Das

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I purchased two fans (Arctic F9 PST CO) and installed in Push/Pull config to improve the CFM since it was already the CFM of a single fan is pretty low.

I ran AIDA64 as well as Prime95 Small FFT tests and my CPU temp did not cross 55. Most of the time it was at 54. A CPU Diode temp, which I believe is the core temp was around 38-39. I believe these are pretty decent temperatures.

I also added two 120mm fans to the top of the case (Corsair Carbide 100R) that blows air directly into the heatsink.

This, I think is quite an improvement over the 2800RPM stock fan.
 
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Darkbreeze

Darkbreeze

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Turn those fans around. You are just blowing hot air back down on to your components. You will see a greater increase in cooling performance if front, bottom and side fans are intake, and top or rear fans configured as exhaust.

Cooling performance is also maximized when there are more exhaust fans than intake, a classic negative pressure configuration.

Basically, like this. This is the standard arrangement that has been proven to be most effective for 99% of modern desktop tower configurations.


2008izm.jpg
 
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