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Internal wind tunnel for graphics card

post #1 of 13
Thread Starter 
I have seen a wind tunnel project done in a Chinese forum and I am abstracting it here. This topic should be of interest to the air cooling guys.

A wind tunnel is constructed to direct fresh ambient air from case front intake fan to the graphics card's intake fan(s).

A HD5850 (with Gelid Icy Vision) inside Corsair 600T is used as a test subject.

Pic 1: measuring dimensions
Pic 2: use hard paper to build a cheap prototype
Pic 3: bottom side of prototype
Pic 4: prototype fitting into 600T for fitness and thermal testing
Pic 5: cutting acrylic pieces with prototype as template




post #2 of 13
Thread Starter 
Pic 6: final product in place
Pic 7: furmark without wind tunnel
Pic 8: furmark with wind tunnel

Result:
A drop of 5C load temp. Not bad at all.
When this kind of internal wind tunnel is coupled with an external air duct, a total drop of 10C load temp is easily achieved.

Note:-
a. This wind tunnel takes into consideration that the HD5850 is being cooled by Gelid Icy Vision. Note the red arrows (in pic 4) are not obstructed in their escape path
b. Due to limitation of 600T, if such a wind tunnel is deployed, the HDDs will not receive much air cooling. It is preferable to move the HDDs to the 5.25'' bays.


post #3 of 13
Good work.
post #4 of 13
That looks fantastic!
    
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post #5 of 13
Do all gpu coolers pull air in from the fans or are there some that dump the hot air into your case?
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post #6 of 13
Quote:
Originally Posted by Tatakai All View Post
Do all gpu coolers pull air in from the fans or are there some that dump the hot air into your case?
As far as I can think, all gpu fans are intake(more or less), but that doesn't mean they don't dump hot air into your case. Most of the cards with exposed cooling fins are a good example of this. Most reference coolers are shrouded and dump the air out the back of the case.
    
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post #7 of 13
Thread Starter 
Quote:
Originally Posted by Tatakai All View Post
Do all gpu coolers pull air in from the fans or are there some that dump the hot air into your case?
The most traditional design is the 'front single fan intake and rear exhaust'. See pic 1 below showing a reference cooling GTX570.

Some reference cooling cards (eg GTX560 Ti) pull air in with a central fan and dumps ~33% air via its rear and ~66% via its front. See pic 2.

Non reference cooling (and basically all aftermarket coolers) design calls for air being pulled in centrally and dumps heat omni directionally. See pic 3 for example.

I think, this kind of internal wind tunnel acts with 2 functions:-
a. ensure cold air (ie unwarmed by other components of the system, eg harddisks) is delivered to the card's intake fan(s)
b. ensure hot air (from card's internal exhaust and hot air by other pc components) does not get sucked by the card's intake fan(s)


post #8 of 13
Did this with cardboard a couple years back, worked like a charm.
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post #9 of 13
A 5c drop is nice.
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post #10 of 13
Very nice, gives me a few good ideas for my case and gpu.
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