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Slightly noobish question about fans

Last response: in Systems
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July 8, 2014 6:21:21 PM

Hi,
I recently bought a junky Dell PC from a friend really cheaply, and I am looking to upgrade it. I have poked around the case, and one strange thing that I have noticed is that, on both the cpu cooler, and the case fan, the fans are pointed inwards towards the case. Aren't CPU fans supposed to be blowing air across the heatsink, not sucking it across the heatsink? And also, is there any reason why both fans are pointed into the case?
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July 8, 2014 6:46:39 PM

What kind of fan is on the CPU cooler? The regular type? It should probably be reversed if it is. I think that's more efficient, hence why on big custom aftermarket coolers, the (first) fan typically included is mounted on the front instead of on the back where it will have to suck air through the heatsink. It naturally makes it easier for the fan to gather air (i.e. is it easier for you to breathe through a mask or in open air?)

Where is the case fan located?
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a c 135 à CPUs
July 8, 2014 6:47:15 PM

budget?

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July 8, 2014 7:44:55 PM

Gunmetal_61 said:
What kind of fan is on the CPU cooler? The regular type? It should probably be reversed if it is. I think that's more efficient, hence why on big custom aftermarket coolers, the (first) fan typically included is mounted on the front instead of on the back where it will have to suck air through the heatsink. It naturally makes it easier for the fan to gather air (i.e. is it easier for you to breathe through a mask or in open air?)

Where is the case fan located?

The case fan is on the rear of the case, also pushing air into the case. Also, just to clarify, this is the type of heatsi k that looks like this:
http://goo.gl/qREEjx
And air is currently being blown away from the cpu. I will take a picture at the next possible opportunity.
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July 8, 2014 8:21:51 PM

Oh. An Intel Stock CPU cooler? Unless it's spinning counterclockwise, then it's doing its job correctly. You might feel a little draft when you put your hands around it while it is active. That's because there is no enclosure around the blades, so some of the cooling power could (possibly) be lost. Does it feel noticeably warm when you touch the heatsink while active? Do you have the CPU model or temperature readings? If it's above or around 60C, then you might want to consider replacing it with a better option to extend the CPU life.

The case fan might be oriented that way because of the lack of cooling that Dell supplies with their PCs. The rear fan mount is usually one of the smallest case fans, so it's the cheapest to install a fan in. What model Dell is it? Depending on the model, you could mount a front fan for better ventilation.

What are you considering for upgrades?
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July 8, 2014 8:49:58 PM

Gunmetal_61 said:
Oh. An Intel Stock CPU cooler? Unless it's spinning counterclockwise, then it's doing its job correctly. You might feel a little draft when you put your hands around it while it is active. That's because there is no enclosure around the blades, so some of the cooling power could (possibly) be lost. Does it feel noticeably warm when you touch the heatsink while active? Do you have the CPU model or temperature readings? If it's above or around 60C, then you might want to consider replacing it with a better option to extend the CPU life.

The case fan might be oriented that way because of the lack of cooling that Dell supplies with their PCs. The rear fan mount is usually one of the smallest case fans, so it's the cheapest to install a fan in. What model Dell is it? Depending on the model, you could mount a front fan for better ventilation.

What are you considering for upgrades?


My bad, I wasnt really clear. It isnt a stock cooler, just a cooler with the same general design. It has the capability to be Installed backwards. It has a typycal fan on the heatsink. I think it is an inspiron 550 or something, but I will check and provide a picture when I can. It doesn't look like there is a space in the front for a fan to be installed into, just some vent holes. CPU temps are normal, but the integrated gpu is crazy hot, like 80c at idle.

I'm going to install a gtx 750ti card, and I want to make sure that it doesn't cook itself.
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July 8, 2014 9:12:22 PM

Looks like it doesn't have a front fan mount. But there was a guy who posted a build log of his modding of an Inspiron 570 (with an identical case) into a light gaming rig with an old GTX 460. He talks a bit about temps within the case, how he managed to mount some smaller fans in the front, and more stuff. Might help you with what you're trying to do.
http://en.community.dell.com/support-forums/desktop/f/3...

If I were you, to keep things cool with a GTX 750, I would replace the CPU cooler with a more powerful one of a tower-stype CPU cooler format so that it can have the fans aimed to blow air directly out the back case. Replace the rear fan with a better model and orient it so that it blows air out as well. That way you evacuate heat as quickly as possible out of the case so that the GTX 750 can spill its heat into a cooler case. Even without the 80mm fans that that guy put in the front of his case, you should be able to generate enough pressure to keep pulling cool air in. If you want to go all out, some people have drilled or CNC-milled custom vents for their cases and side panels for more fans.

Mind your stock power supply. Not sure if even the low power use of the 60W GTX 750 Ti can keep it from overloading. But if you do have to replace it, you could get one with a massive 120mm fan to also suck air out of the case.
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!