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Scythe Infinity: single fan vs. dual fan - Page 2

post #11 of 30
I dunno, ask your physics teacher
Yea, you could, but why would you do it ?
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post #12 of 30
my dad is a physics professor, i could just ask him

there isnt much physics to it LOL i mean come on, fluid dynamics is an EASY concept to understand. i just think that more air moving across more SA of hte HS will decrease temps by cooling the HS mroe so increasing delta T and thus teh speed/efficiency of heat transfer btwn die and HS.

theres my physics explanation for it. AP Physics put to good use, but really just common sense...
    
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post #13 of 30
Thread Starter 
Quote:
Originally Posted by amd_hardsoftware View Post
it kinda makes sense all teh air is FORCED through the gaps in the fins with VERY HIGH PRESSURE, disapating heat from HS and rushing out through the sides of the HSF or the gaps where there is no fan to push the air back in.


also WHY would there be NO difference? i dont get that...
well, re: the four fans ... it simply seems like two fan's pushing 110CFM each would dissipate heat just about as fast as four pushing 110CFM each ... at least just blocked onto one another.

just doesn't seem like it would be *that* much more efficient at getting the heat off the metal ... maybe a tad bit ... but not too much.

take the same four fan idea and somehow wind-tunnel it ... i mean, with a good few inches of space between each fan, which would allow the turbulence pattern's to even out, thereby doing away with the vortex like area created just in front of the fan hubs ... and you'd most likely see a significant improvement.

a decent wind tunnel type setup would also signficantly improve the two fan set up.

for instance, if my cooler/fan setup ran as-is for six months non stop ... and i then removed the fan's from the cooler, the dust pattern on either side of the cooler would show a distinct clear spot in the middle of the cooler where the fan hub is. move those fan's back away from the cooler though and duct their flow via a tunnel ... then by the time the air hits the cooler, it's had a chance to distribute itself more uniformly along the cooler's front ... thereby utilizing more surface area with direct wind flow contact.

just some thoughts ...
    
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post #14 of 30
i meant one fan on each side of the HS, not two stacked onto one another
    
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post #15 of 30
Email Scythe they will send you another fan holder for free.

pink
post #16 of 30
Quote:
Originally Posted by Mr Pink57 View Post
Email Scythe they will send you another fan holder for free.

pink
nope. I asked them about it and they wanted to charge me 10 bucks for one pair of clips + shipping. Why not make one out of some coat hanger?
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post #17 of 30
Quote:
Originally Posted by leojharris View Post
scythe infinity: single fan vs. dual fan
--------------------------------------------------------------------


the main thing to note, however, is that the two fan's running at a low RPM setting, still outperformed the single fan at it's max RPM setting; and the two fan's running at 1200RPM were significantly, even extremely more quiet than the single fan running at max RPM's. both fan's running at 1200RPM's were near imperceptible to the ear ... i had to kill the rest of my case fan's to hear them.

so all and all, i'm happy with the results; now i'm running even cooler and i can't even hear the heat sink fans.

hope this info is helpful.

happy new year!

This post is extremely helpful! I run into the same exact problem concerning the duct running flush with exhaust.

Right now I have this 89cfm fan on the infinity. It runs at about 1900rpms. I have the same fan for the exhuast. I'm thinking of getting a fan controller because well, 3 fans running at 1800rpms is loud for me.

What is the stock Scythe fan rated at? I'm wondering if I can just used that as the second rubber band mounted fan, and then just drop all the rpm's.

What I find especially usefull from your post is that fact that the lower rpm dual fan setup is a little cooler than the single fan high rpm setup.

Thanks for the ideas!

And very nice OC!!!
    
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post #18 of 30
Thread Starter 
Quote:
Originally Posted by MasterBillyQuizBoy View Post
What is the stock Scythe fan rated at? I'm wondering if I can just used that as the second rubber band mounted fan, and then just drop all the rpm's.

What I find especially usefull from your post is that fact that the lower rpm dual fan setup is a little cooler than the single fan high rpm setup.
the stock scythe fan is 1200RPM, pushing around 49CFM ...

if you used it on the exhaust side of the cooler, you could still use it with your 89CFM fan due to the fact that your 89CFM fan's output is greatly (near 50% i'm sure) diminished by the fact that it's blowing through the rather dense cooling fin assembly of the infinity.

in my opinion, that's why running a push/pull dual fan set up works well with the infinity ... it has a lot of interleaved fins packed quite tightly together and it's tough to get a good solid flow of air through them. adding the second fan's promotes more consistent and steady flow across the dense fin assembly.

do some tests running the stock scythe fan on the exhaust side, it would be the "pull" fan in the "push > pull >" scenario. and don't use the rubber band mod for more than a couple months ... order some new mounting pins ... very temporary modification.

also, you should be more quiet all around as you'll only need to run your cpu fan's at around 50 to 50% of max to get the same cooling your getting now at high speed.

have fun.
    
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post #19 of 30
Dude thats awesome. i'm about to get me one of those. i hear they dont install right on the AMD platforms though(fan not facing right way)
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post #20 of 30
Quote:
Originally Posted by enz660 View Post
nope. I asked them about it and they wanted to charge me 10 bucks for one pair of clips + shipping. Why not make one out of some coat hanger?
I emailed them and they shipped another one free of charge. I guess its all on how you word it...

pink
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