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post #31 of 39
Here is some data on these two exact fans from Martin. In both sets of graphs the blue lines are the same set of data. Notice how the San Ace's noise level is about 1db higher than the Yate Loons, whereas the Gentle Typhoon is far under it. The San Ace also consumed a lot more power, even at similar RPMs.





As you can see the GentleTyphoon at 1800 RPM (Full Power) put out 35 CFM while the San Ace at 1880 RPM only put out 32 CFM while also producing more noise. I'd go with the Gentle Typhoon.
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post #32 of 39
Thread Starter 
Good data. My concern is still static pressure. I don't know how many radiators have this fin density, but I can only find one test on high FPI rads and that's Martin's triple rad comparison v2.

I'm not trying to be difficult, I'm really not. It's just that I have encountered so many strong opinions here stating that with my rad, I need as much static pressure as I can get. I don't know if it will make that much of a difference in the end, but I want to gather the extra data I mentioned. Then I'll have enough information to decide what the available options are between noise and pressure.
    
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post #33 of 39
I "robbed" friends and some local stores for dead/damaged fans, and cut them as shrouds.

Didn't cost anything

I used push->shroud->rad->pull with AP15s and GTX360.



This was mainly to lower noise as I use so many fans, and because the AP15 have a decent static peasure (not like 38mm fans, but lower noise even at full power).

The GTX360 can easily handle lower RPM fans very well. You are not going to have your system in a test tube, and there will be other factors to air movment, so the difference is going to be big. Maybe 2-3c of water out vs in.
Edited by Defoler - 1/11/11 at 5:16am
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post #34 of 39
Quote:
Originally Posted by Glacialis View Post
Good data. My concern is still static pressure. I don't know how many radiators have this fin density, but I can only find one test on high FPI rads and that's Martin's triple rad comparison v2.

I'm not trying to be difficult, I'm really not. It's just that I have encountered so many strong opinions here stating that with my rad, I need as much static pressure as I can get. I don't know if it will make that much of a difference in the end, but I want to gather the extra data I mentioned. Then I'll have enough information to decide what the available options are between noise and pressure.
What he is saying is static pressure scales positively with rpm. The San Ace will have much reduced static pressure at lower rpm. You are only getting more noise with a voltage reduced San Ace compared to a Gentle Typhoon.

People buy San Aces so they can run them at 12v when they're benching. At 12v, San Aces are loud!
post #35 of 39
Thread Starter 
Defoler: Holy fans, Batman! What do you think your results would be if you had push->shroud->rad, no pull? Given that AP-15s are indeed quieter, I might be installing them in pull as well, but I worry about the combined noise of 6 AP-15s with shrouds. Granted, that's probably the quietest + most efficient combo I'm going to get right now. Dunno if I'll add that second 5870 or not later on...bah.

PS: Did you mean "so the difference isn't going to be big"?


Riou: In terms of avatars, you win the internets twice over. Okami FTMW!

I understand that everything a fan does scales with voltage. What I would dearly like to see is data from these two fans at the same RPM, including pressure, CFM, and dBA. I was going to go with AP-15s in the beginning but was persuaded to go with the San Aces. So many people said "static pressure is better on these, even undervolted" that I'm getting whipsawed with the reaction to this thread.
Edited by Glacialis - 1/11/11 at 7:37am
    
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post #36 of 39
Quote:
Originally Posted by Glacialis View Post
Defoler: Holy fans, Batman! What do you think your results would be if you had push->shroud->rad, no pull? Given that AP-15s are indeed quieter, I might be installing them in pull as well, but I worry about the combined noise of 6 AP-15s with shrouds. Granted, that's probably the quietest + most efficient combo I'm going to get right now. Dunno if I'll add that second 5870 or not later on...bah.

PS: Did you mean "so the difference isn't going to be big"?
The AP-15s are by far the quietest setup you could get for that radiator and those components. Keep in mind when the computer is idling the fans can be reduced to around 600 RPM where they are virtually silent.

Also, a "big" temperature change is dependent on what you are using the computer for. It might be a big deal to him considering his extreme computer (over $2000 just on graphics cards) but to you 2-3C is probably not a huge issue.

EDIT: Look at my above graphs to see direct comparisons between those two fans. It has RPM, CFM and dbA. Static pressure has already been factored in as the fans are pushing through an radiator, and thus CFM has been reduced. If you look closely you can see that the GentleTyphoons are much better than the San Ace in their RPM range.
Edited by charliehorse55 - 1/11/11 at 7:41am
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post #37 of 39
Thread Starter 
I do see the CFM data, however, unless I'm reading google wrong, the Swiftech MCR-120 has 8 FPI. This makes it a low-FPI radiator, right? I did this quickly so please correct me if the FPI is incorrect. Now, a Black Ice GTX has 20 FPI.

If those numbers are accurate, then I'm not sure that the data for a 8 FPI rad is entirely valid for a 20 FPI rad due to the higher pressure required to get the air through.
    
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post #38 of 39
When in doubt, buy both sets of fans and examine the results for youself. Then post what you find for all of us to benefit. The data has been presented, digest what you can, don't ponder too much and just go for it .
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post #39 of 39
Thread Starter 
Bah. You and your efficient logic! Let me put it to you guys this way:

Can I go wrong with San Aces? No, but there may be more noise than I'd like.

Can I go wrong with AP-15s? No.

Problem solved!
    
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