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Scythe Gentle Typhoons Really Do Live Up to the Hype - Page 3

post #21 of 45
Quote:
Originally Posted by longroadtrip View Post

This "AF" fans vs. "SP" fans is pure marketing rubbish. ANY fan can be used as a case fan. Fans with a higher static pressure will as an added bonus perform well on rads. The GT AP fans are suitable for both uses.

It's not marketing in the least... Yes an SP fan will work as a case fan, but it will move less air. An AF fans need to do one thing, move air in and out of the case. An SP fan needs to move air at high enough pressure to generate sufficient turbulence within the fins while moving enough air to prevent the air from heating up too much, which would reduce performance. AF fans don't generate much pressure, because they're not designed to cool things, they're designed to move cool air into the case, and hot air out of the case.
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post #22 of 45
Quote:
Originally Posted by ZytheEKS View Post

It's not marketing in the least... Yes an SP fan will work as a case fan, but it will move less air. An AF fans need to do one thing, move air in and out of the case. An SP fan needs to move air at high enough pressure to generate sufficient turbulence within the fins while moving enough air to prevent the air from heating up too much, which would reduce performance. AF fans don't generate much pressure, because they're not designed to cool things, they're designed to move cool air into the case, and hot air out of the case.

ANY fan will do this. For a regular case fan, what you are concerned with is CFM. As an example, the Corsair AF performance series fans have a rating of 63.47 @ 30 dBa. The AP-15 has 58.3 CFM at 28 dBA. The performance difference between the two as a case fan is negligible, but the AP-15 will also perform well as a radiator fan because of it's higher static pressure.

And yes, it is pure marketing rubbish...before Corsair labelled fans AF or SP had you ever heard of it? thumb.gif
Edited by longroadtrip - 3/16/14 at 10:30pm
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post #23 of 45
If it's a filtered case fan the filter can add quite a bit of restriction to the point a fan with higher static pressure will easily outperform a fan with higher air flow. Every actual test I've seen done, like the one from vapor at extremesystems, has shown that case fan filters, even when clean and not already clogged with dust, often will add as much if not more restriction than a typical rad will, to the point where poor static pressure fans become almost useless at anything except making noise.
post #24 of 45
Quote:
Originally Posted by longroadtrip View Post

This "AF" fans vs. "SP" fans is pure marketing rubbish. ANY fan can be used as a case fan. Fans with a higher static pressure will as an added bonus perform well on rads. The GT AP fans are suitable for both uses.

Well, not exactly. Its got to do with the blade design and what the fan is tuned to favour. In the case of Corsair AF vs SP the AF blades are very steep and narrow. So the AF will move more air at 1100 than an SP at 1450. They also move more air than a GT at 1150. At the same time they only have a static pressure of 0.75mmH2O at 1500 vs the SP 1.29 at 1450. The SP's will maintain airflow through resistance much better than the AF version.

Its just that pretty much all other brands pick the middle ground rather than having two versions.

Edit: The AF will move 40CFM at 1100 and the GT will move 37CFM at 1150. It might not sound like much of a difference but speeding the GT up to 1450 only moves 50CFM.
More CFM at lower RPM when restriction is not a problem.
Edited by Jakusonfire - 3/16/14 at 10:50pm
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post #25 of 45
Once again I go back to the "look at the CFM/static pressure/dBa and choose the fan that is best for your particular situation." My only argument is somebody telling a person they don't want a fan with static pressure if they are using it as a case fan. This is simply not true. In fact, my argument would be that a higher static pressure fan coupled with decent CFM would be more versatile as it could later on be used as a rad fan as well.

I've used Noiseblocker fans for years. Widely regarded as one of the best case fans, they are also excellent performers on rads. Part of why they are so successful is because they offer multiple speeds so you can tailor the fans to your particular setup. This AF vs. SP rule is ridiculous.
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post #26 of 45
Yes that is fair enough, but its just not true that there is no difference. It may be that really AF tuned fans are only really better as exhaust fans rather than bringing air in.

With Scythe maybe its like GT's vs Slipstream or glidestream. The Glidestream supposedly move lots more air than the GT per RPM but they don't even seem to mention an SP figure.
Edited by Jakusonfire - 3/16/14 at 11:12pm
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post #27 of 45
The performance difference is very minute though...is it measurable? Yes...in all practicality, does it make any real world difference? No...
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post #28 of 45
I would have to disagree... the GTs are great fans but IMO they are over hyped.
 
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post #29 of 45
I won't disagree with you specifically about GTs being over-hyped (I prefer NB fans and a few others.) For what they are, they are way overpriced. When I was getting them for $10/fan, they were worth it...at $20 each, there are far better alternatives out there.
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post #30 of 45
Just passing by, what are NB fans ?
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