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air flow plan critique

post #1 of 11
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Like a lot of people, I want something that can really cool well when needed, but not sound like a vacuum cleaner all the time; it's going in the livingroom hooked to the tv for gaming and general use. I want slight positive air pressure to cut down on the dust.

I've been reading a lot and think i have come up with a plan. Do you think it looks solid to reach my goals?

I have a corsair 650d for a case with 200mm front filtered intake and top exhaust fans. There is a single 120mm fan on the back of the case. There is a 3 position fan controller with 4 fan inputs built into the case. The 200mm fans are 92 cfm.

I plan to install this 3 bay 5.25" 120mm fan holder. I picked it because i think it will be functional, it provides a filter, and looks better than a bunch of bay covers. I dont have much use for getting one that holds hdd and blocks the air path. I also like how it will run fresh air right through a TR silver arrow. I am curious about running this hsf passively.

I'm going to use Noiseblocker M12-S3HS in the 5.25 bay and to replace the stock rear 120mm fan. I got 2 of these fans for $10 each from a friend. At full rpm they move 73cfm and are pretty close to the same dba as the 200mm fans i have. They also are also reviewed as quiet undervolted, come sleeved and only need 4.5v to start up.

I feel like this is a good start but would at best be neutral pressure and most likely slightly negative pressure because of restriction of the intake fans due to the filters. I could cut another intake into the bottom of this case, but i am not really wild about that idea. I could use the stock 120mm exhaust fan, which i assume moves less air, but i'm not sure exactly how much less air and i already have the m12s3hs. I looked at some resistor cables, but they seem to cut voltage too low.

I plan on using a small fan controller. I think it is the best option because it is rated at 5V ~ 11V. I'll pretty much just use it as a resistor to drop the rpm on the rear 120mm exhaust fan just enough to create slight positive pressure.

I plan on using it inline with the 3 switch fan controller in the 650d as everything is 3 pin. The stock fans that come with the case have a 7 volt start up requirements, so the controller must put out at least 7v on low. Dropping that a volt or two will still give me enough to start the 120mm exhaust fan.

What do you think of my plan? Any glaring fatal flaws in my thinking or does it sound good?

Here is a quick paint job:

airk.jpg[/URL]
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post #2 of 11
Just install a small air conditioning unit in there.
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post #3 of 11
Pretty standard airflow layout for any modern case so ya looked good and generally works.

Remember, graphics card pull alot of air I don't think you should be playing with fan voltages just to try and get a slight positive or negative pressure, I personally vouche for Negative pressure because the exhaust fans are generally closer to the components then the intake fans.

Its not going to sound like a vacuum cleaner trust me those are normal fans unless you start putting in deltas your fine.

if your really worried can install a PCI Exhaust , and or also flip the PSU around to draw more air inside the case.

Just don't have an exhaust-less 8800GT blowing hot air into the PSU like I did once =P
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post #4 of 11
Quote:
Originally Posted by faulkton;12656104 
What do you think of my plan? Any glaring fatal flaws in my thinking or does it sound good?

Right now it's looking good and those Noiseblocker's seem to be quite high quality, now I want to look into them myself smile.gif. Once you have the system all built up and running, I'd do a simple test of CPU temps under load with both the top 200m as exhaust and as intake. I myself have found that, although the rule of hot air rising states otherwise, a top intake fan positioned directly above the front intake of a cooler can lower temps by quite a few degrees.
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post #5 of 11
Your case + the 5.25 bay insert would be perfect for this kind of airflow:

Beta_Evo_Schemo_-_2c.png

Compare temps - top intake vs top exhaust. Most people get 5c better cooling: bottom-up airflow presents warmed air to your heatsink.
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post #6 of 11
i like that setup ^
    
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post #7 of 11
Quote:
Originally Posted by samus1677;12665312 
i like that setup ^

Me too smile.gif

Dropped my temps roughly 4C on load, although I don't have any fans in my 5.25" bay and I don't exactly have the best fans. As it stands, I think my CPU runs cooler idle than my SSD.
post #8 of 11
Thread Starter 
all good advice. It looks like I have an ok place to start from at least. Now i just need to wait for the UPS man and build. Everything here by friday, no time to build until tuesday :/
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post #9 of 11
I am kinda curious, why does that corsair look exactly like a cm 692? Except for the interior gromets, the tooless drive bays looks so similiar I would sue for patent infringement. Ah well, looks like they could be th same company just diffrent models. The front has a cleaner look then my cm 692, and I like the glass side, but they should have put a fan slot in in or two. That's definatly a mod that would be nice for that case.
Edited by Maelthras - 3/9/11 at 7:17am
post #10 of 11
Thread Starter 
Quote:
Originally Posted by Maelthras;12667651 
I am kinda curious, why does that corsair look exactly like a cm 692? Except for the interior gromets, the tooless drive bays looks so similiar I would sue for patent infringement. Ah well, looks like they could be th same company just diffrent models. The front has a cleaner look then my cm 692, and I like the glass side, but they should have put a fan slot in in or two. That's definatly a mod that would be nice for that case.

i cannot answer this. I just liked the clean and simplistic look of the case. When i was cyber stalking sites looking for one in stock i did find this:

http://www.newegg.com/Product/ImageGallery.aspx?CurImage=11-147-107-TS&ISList=11-147-107-Z12%2c11-147-107-Z13%2c11-147-107-Z14%2c11-147-107-Z15%2c11-147-107-Z16%2c11-147-107-Z17%2c11-147-107-Z18%2c11-147-107-Z19%2c11-147-107-Z20%2c11-147-107-Z21%2c11-147-107-Z22%2c11-147-107-Z23%2c11-147-107-Z24%2c11-147-107-Z25&VSList=11-147-107-V05&S7ImageFlag=1&Item=N82E16811147107&Depa=0&WaterMark=1&Description=Rosewill%20BLACKHAWK%20Gaming%20ATX%20Mid%20Tower%20Computer%20Case%2c%20come%20with%20Five%20Fans%2c%20window%20side%20panel%2c%20top%20HDD%20dock

looks a lot like the CM and the 650d.
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