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Noctua NH-D14 in a white Corsair 600T - upgraded exhaust fan

post #1 of 11
Thread Starter 
Wondered what you thought of this fan alteration. I've replaced the stock 120mm rear exhaust fan with a Noctua NF-P14. I realise it looks like there are two fans on the exhaust, but that's because the other is an empty duct without the fan and motor. The combination of larger 140mm fan and the duct seems to have dropped the temperature on my i7 920 by around 7 degrees celcius.

    
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post #2 of 11
What the heck?
Frozenoblivion
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Frozenoblivion
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post #3 of 11
Duct the cooler exhaust out the back vent with no fan and it would probably be even better wink.gif
post #4 of 11
Thread Starter 
Quote:
Originally Posted by doyll View Post

Duct the cooler exhaust out the back vent with no fan and it would probably be even better wink.gif

I'm not sure what you mean, or how that will improve airflow through the Noctua CPU cooler?
    
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post #5 of 11
Box from the cooler exhaust to the rear vent. This moves all of the heated air from cooler directly out the back of case so none of it can re-circulate around in case and raise case temps.. so case stays cooler.. so cooler intakes cooler air.. so cooler stays cooler. Cool? thumb.gif

Prototype in wife's system. GPU is also ducted out back of case. So all heated air from CPU & GPU are moved out of case. Case is positive airflow with 4x filtered Antec tri-cool fans.
Nicky computer back with ducting.jpg

Here are a couple more pics of ducting
post #6 of 11
Thread Starter 
Ah, OK, thanks, I understand you now. Yes, I did think about making a custom duct something like yours to further boost airflow. Having that duct without the third pull fan (as in your case) isn't going to be as good as having the same duct with an additional pull fun. I'm also not sure on whether Noctua plus two fans plus duct is going to be cooler than Noctua plus 3 fans plus current partial duct. I wouldn't like to call it without doing some actual measurements.

The solution I have is simpler and easier, and it has the advantage that hot air from other motherboard components is still getting extracted. Given that my i7 920 at 3.8GHz is running at 70-75 degrees C with Prime95, I probably don't need any better cooling than this.
    
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post #7 of 11
My experience says your CPU will be cooler with 2 fans and duct than with what you have now. wink.gif Not saying you need to do it. Just that segregating heated exhaust from cooling intake air keeps inside of case cooler. thumb.gif

Duct in first red Phanteks pic was out top of my R2 (second pic is out back of R2). With exhaust out top I could unplug all fans and things never went above 70c... and that was after 25-30 minutes of rendering with CPU graph drawing a straight line at 100% load... and when rendering ended it would take about 10 minutes for everything to cool back to normal. With fans running temp maxed out in about 3-4 minutes at 50c with fans running 950-1050rpm... and when rendering ends it only takes a couple of minutes for cool back to normal.

Obviously with fans off not just the CPU/cooler got warmer but so did mobo chips, GPU, HDDs, etc.

R2 has 2x 140mm vents in top that can be open or closed off with sound dampening panels. These were both open with duct out top so cooler was acting as a chimney.. and so was case.. moving air up with convection.

All of above was with i7 980. When I changed mobo from X58A-UD3R to UD5 I changed from Geil RAM to Crucial which is shorter and I could mount cooler facing back... Which I did and was able to replace the top sound dampening panels. I also cut out the back case vent grille and left the mobo back panel off to allow NB heatpipe radiators to vent easier. Can't say it made it any quieter but now I can pile more carp on top of case smile.gif

Even experimented with boxing in bottom of cooler so the airflow from bottom of front fan was forced out only through the NB heatsink radiators. UD5 has 3 of these around CPU socket; bottom, back and top. Doing this only lowered NB temp from 51-57c to 47-53c. If.. no, when I have cooler out again I may not use it again. Guess it depends on if I have any problems with it staying in place while removing/replacing cooler. wink.gif
post #8 of 11
Thread Starter 
Yeah, that explanation and opinion is just not working for me. I'm super sceptical that a passive duct is going to give better cooling than an active, fan powered duct.
    
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post #9 of 11
All ducts are passive. It's the 2 fans on cooler that would push all of cooler exhaust air though it.

The reason it will do a better job is your "duct" is not a duct from cooler to exhaust vent. Just look how much of your fan shroud and fan is not capturing all of the heated air coming out of cooler. And because of the shroud spacer none of that uncaptured heated cooler air can is being sucked out of case.. and therefore it is mixing with the rest of your case air warming it up.

A duct from cooler to exhaust lets none of the heated exhaust air escape. Simple as.

Just look at your posted picture. rolleyes.gif
Sorry for telling you the truth and explaining how it all works. Obviously you've made up your mind and don't want to know. redface.gif
Edited by doyll - 11/16/12 at 2:00am
post #10 of 11
Thread Starter 
LOL, yeah whatever works for you. I suggest not taking physics in school though.
    
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LG Blu Ray RW Noctua NH-D14 Windows 8 Dell 2405FPW 
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OCZ Agility 3  WD Black 2TB WD Green 2TB WD Black 1TB 
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LG Blu Ray RW Noctua NH-D14 Windows 8 Dell 2405FPW 
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