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Should I push-pull RX360? - Page 2

post #11 of 18
Quote:
Originally Posted by stren View Post

At this point it's down to bearing noise vs air noise. Hard to say, I certainly haven't tried it, at that point it may become quality of sound issue too. Personally though I wouldn't buy 6 GT's to run them at 800rpm. If they were $5 yates, I'd say sure go push pull at 800 rpm. I also wouldn't go low speed on an EX, the RX should outperform it at low speed according to bundy. Low FPI rads usually do.

Yes, now I see also from the graph that push pull at low speeds is not very beneficial.
    
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post #12 of 18
For each fan you add the noise doubles. Its a lit louder with 6 fans but i would recommend push/pull over RX push.
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post #13 of 18
I did push/pull on all my rads because I had the room for it. Maybe not necessary... but I didn't hurt to do it. I have 10 x GT AP15's on my rads (360 + 240) alone... and a total of 17 fans (including psu fan) in my case, and the loudest thing on my rig is the PSU. My bro-in-law always comments on how much my rig is quieter than his air-cooled rig.smile.gif
    
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post #14 of 18
Quote:
Originally Posted by moa. View Post

Yes, now I see also from the graph that push pull at low speeds is not very beneficial.

Well push/pull always helps, but it depends if it's worth the cost, particularly with gentle typhoons which are pricey. Often you might be better with an additional radiator and cheaper fans. At such low rpm's an authentic yate loon will perform similarly for much less money.
     
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post #15 of 18
Quote:
Originally Posted by moa. View Post

But then, would say, six 800RPM GT's on an EX360 be quieter than, for example three 1100RPM?

Yes,
I've tested that too on my fan rig, two fans in push/pull undervolted will produce more CFM per noise level than one set in push alone. The only real downside is space and cost, but depending on noise tolerances that might afford you cheaper fans than GTs.

GTs really only show big benefits in the 1000-1800RPM range, if you are dialing down to 800RPM, you could use something like Arctic Cooling F12s at 1/3rd the price of GT15s, so cost MAY not be a constraint depending on the details.
    
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post #16 of 18
Thread Starter 
Thanks guys. So basically push-pull EX is better than push/pull RX. What if I did push-pull on the RX?
 
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post #17 of 18
Quote:
Originally Posted by burntphoenix View Post

Thanks guys. So basically push-pull EX is better than push/pull RX. What if I did push-pull on the RX?

No -

P/P RX360 > P/P EX360 at low rpm

P/P EX360 > P/P RX360 at high rpm

From bundy's testing the cross over point is somewhere between 800-1200rpm


Here's the results at 800rpm, lower is better (not sure if this data is push, pull or push/pull, but trends should be similar)

80027vq5.png

Martin - are you testing the EX in your 360 round up?
Edited by stren - 4/12/12 at 8:29pm
     
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post #18 of 18
Quote:
Originally Posted by Martinm210 View Post

Yes,
I've tested that too on my fan rig, two fans in push/pull undervolted will produce more CFM per noise level than one set in push alone. The only real downside is space and cost, but depending on noise tolerances that might afford you cheaper fans than GTs.
GTs really only show big benefits in the 1000-1800RPM range, if you are dialing down to 800RPM, you could use something like Arctic Cooling F12s at 1/3rd the price of GT15s, so cost MAY not be a constraint depending on the details.

I actually have this model of fans:

516

but they make ticking noises at 800RPM :/

I'm eagerly awaiting your fan on rads review, as I'm looking for an upgrade because of this problem smile.gif
    
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