Lower case fan rpm decrease cpu temp?

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Mike_117

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Nov 22, 2015
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I just built a new PC and I am using this case (https://www.newegg.com/Product/Product.aspx?Item=N82E16811854051) I added two Phanteks PH-F140SP 140mm fans to the front intake and moved the 120mm to the top and also added another 120mm to the top exhaust.

My cpu, i5-7600, seems to react better when the fans are set to the lowest setting, and when I ramp the rpm up, the temp increases. Why is this? What can I do to fix it.

My CPU hovers around 63C while at load, which I'm told is fine. In a previous build I used the i5-6500 which maxed out around 50C. Is the higher clock frequency of the 7600 to blame for the higher temps?
 
Solution
greens
I actually have a write up in progress on this.

My hypothesis is that as you increase fan speeds you end up reaching a point where you're no longer moving more air, but just creating turbulence. It could also be that you're moving air, but its just not having a chance to heat up any.

In my situation increasing fan speeds beyond around 50% doesn't impact temps. Anything more than 50% fan speed and my temps stay the same as if it were still at 50%.

But your temps go UP? with increased fan speed? That seems a bit odd!.

63c under load is FANTASTIC.
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greens

greens

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Jan 27, 2012
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I actually have a write up in progress on this.

My hypothesis is that as you increase fan speeds you end up reaching a point where you're no longer moving more air, but just creating turbulence. It could also be that you're moving air, but its just not having a chance to heat up any.

In my situation increasing fan speeds beyond around 50% doesn't impact temps. Anything more than 50% fan speed and my temps stay the same as if it were still at 50%.

But your temps go UP? with increased fan speed? That seems a bit odd!.

63c under load is FANTASTIC.
 
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Solution
kittle

kittle

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Dec 8, 2005
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use your hand and a piece of tissue to make air is actually flowing in AND out of your case. make sure you can feel the air coming out and going in. then use the tissue to make sure its flowing the right way.

Also take note of the temperature of the air. If there is no warm air coming out, then its not cooling anything.

lastly, check your cable management to make sure there is a clear path for the air to flow from intake fans into your case -- again use your hands and a piece of tissue to verify this.
 
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piwo2805

piwo2805

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Sep 10, 2013
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I had the same problem as you and finally came up with the solution. I only had 2 fans in my case, one on the front (intake) and one on the rear (exhaust). I didn´t have bad temps with this configuration: 32ºC IDLE and 53-56ºC while gaming (my CPU is an i5 6400). I installed another exhaust fan on the top of my case and suddenly my temps increased drastically (32º IDLE but 62-65º while gaming). It was a cheap fan (4€). I removed that fan and placed it on the front as an intake fan and my temps became great. Now I have 29ºC IDLE and 47-50ºC while gaming. So try removing the top exhaust fan and see what happens. If the top fan it´s not high quality it might be causing air flow problems and probabbly will be better to go without that fan. I´ve ordered on amazon an Artic Cooling F12 pwr pst co (aparently it moves a lot of air) for the top exhaust. I´ll post if it improves my temps or make them worse.
 
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