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Hackin Builders, Advice Please on Case Cooling
Posted by: Panopticon
Date: July 26, 2011 07:45PM
Have a case very similar to this one:



with the following fans:
  • 120mm Front Intake
  • 120mm Rear Exhaust
  • CM HTX3 CPU Cooler w/ Twin 92mm in Push-Pull *
  • PSU has its own twin fan, Push-Pull setup also.
[* rear cooler fan blows into the case exhaust fan]

So, I want to add a 92mm on the side panel where the "cone'
was removed to clear the HTX3 cooler.
Should it Exhaust or should it be an Intake?

I've read conflicting opinions on-line but would appreciate
all 'real world' experiences.

thanks all hail smiley






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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: Trouble
Date: July 26, 2011 07:59PM
I would make it an intake fan because air is pulled directly through that cone down onto the CPU fan.
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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: Spock
Date: July 26, 2011 08:45PM
Quote
Trouble
I would make it an intake fan because air is pulled directly through that cone down onto the CPU fan.

Agreed and make sure that your CPU cooler fans exhaust to the rear so the 120 mm rear fan clear the hot air.

FYI I have found that the cases with a bottom mounted PSU are easier to cool.






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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: AllGold
Date: July 26, 2011 11:31PM
I wouldn't add a fan there at all. You should have good front-to-back air flow and a fan on the side will just disrupt that.

If you absolutely have to put a fan there, feel/test the air going through that grill and make the fan blow the same direction.



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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: Will Collier
Date: July 27, 2011 06:10AM
My case is very similar to that one, if not identical. I have a Scythe Mugen 2 heat sink on the CPU; it is gigantic, so the cone had to go. Installed two standard-sized fans blowing out on the back panel, and that's it.

CPU is an i7 920 overclocked to 3.6GHz, and it's been running without a hitch for two years now, temps in the 40C range.
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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: DRR
Date: July 27, 2011 01:30PM
If you're handy with a Dremel and can DIY, a top-mounted exhaust fan will work wonders for heat dissipation.

Otherwise, my feeling is also that it should be exhaust, but it's a simple enough thing to try both ways and test both. The reason I think it should be exhaust is because it looks like you have a grill on the side there that can function as air intake (which will happen naturally if exhaust > intake)

Since heat rises I would think that making it an exhaust would allow cool outside air to enter near your PCIe cards, and be exhausted out the top side. You may even get some additional video card cooling out of it.

That said, I could be way off - but try it both ways.
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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: Dick Moore
Date: July 27, 2011 01:58PM
I would pass on putting a fan there -- the CPU heatsink-fan system should handle everything just fine if there is cool air coming in the front of the case and hot air going out the back. But in general, fans suck and fans blow, and are just so dang noisy.

No matter what else, do not set your case on the floor -- be sure to have it raised up at least a foot to keep the inevitable hair and dust out of it as much as possible....



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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: M A V I C
Date: July 27, 2011 03:32PM
Airflow is actually fairly simple but there's a ton of people who have really messed up opinions on how it should work.

Front fan should be an intake. Rear fan should be an exhaust. Side fan should be an intake.

You should have roughly an equal amount of intake as exhaust. Some "experts" will say that every fan needs to be an intake fan and that's just wrong. The side intakes like that are meant to blow on the CPU area. You've only got one intake fan and two exhaust fan. Adding another exhaust fan is a bad idea no matter if it's in the top or the side. Putting it in the top will likely rob airflow from the PSU.

Sure the case doesn't "need" a side fan but an intake there can help.




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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: Panopticon
Date: July 27, 2011 05:46PM
Thanks all!

If you're handy with a Dremel...
Yep and I've got access to a MIG welder too smoking smiley

I'm leaning towards opening the side intake to 120mm w/ an exterior filter,
it will blow directly onto the HTX3 cooler. Also I'm going to 'clean up' the
front fan intake & case bezel to improve airflow.

Gotta think about the top fan idea. I currently use the top to hold a
HD dock, USB & FW hubs, and a USB TM drive.






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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: Trouble
Date: July 27, 2011 06:16PM
I don't think you'll need to go that far. The case is designed to provide cool air directly to the cpu fan and you already have a fan pulling air to the CPU heatsink. I'm guessing here, but I'd be wary about putting too big a fan there. The reason is because putting too big a fan there may create some airflow problem around the bottom of the heatsink. I'd think a small fan helping air move into the case would be fine, but I think a large powerful fan may create static swirls at the base of the heatsink.
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Re: Hackin Builders, Advice Please on Case Cooling
Posted by: blusubaru
Date: July 27, 2011 08:12PM
I'm no help. Both of mine are unique. One is in a wood htpc enclosure and the other is in a rackmount server enclosure with overkill on fans. I do however appreciate the information! I'm not an OC'r and haven't had to worry about extra cooling above and beyond retail design.
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