80x25mm Fan Round-Up #1

Fans|Controls
Viewing page 5 of 8 pages. Previous 1 2 3 4 5 6 7 8 Next

DELTA AFB0812SH

Ambient noise at the time of testing was 18 dBA.

Brand Delta Electronics, Inc. Power Rating 0.34A / 4.08W
Manufacturer Delta Electronics, Inc. Airflow Rating 46.62 CFM
Model Number AFB0812SH RPM Rating 4,000 RPM
Retail Availability Yes Noise Rating 40 dBA
Bearing Type Ball Header Type 3-pin
Hub Size 1.47" Starting Voltage 3.0V
Frame Size 80 x 80 x 25 mm Number of Samples 1
Voltage
Noise
RPM
CFM
Power
12V
44 dBA@1m
3790 RPM
59 CFM
3.45W
9V
35 dBA@1m
2910 RPM
45 CFM
2.23W
7V
28 dBA@1m
2230 RPM
34 CFM
1.54W
5V
24 dBA@1m
1440 RPM
22 CFM
1.02W
@10 CFM (3.4V)
20 dBA@1m
760 RPM
10 CFM
0.67W

We said we would include one really noisy fan in the round up, and this is it. Delta fans have long had a reputation for being screamers, and this model certainly justifies it. However, given the large number of fans that Delta sells, it's not inconceivable that they do have some quieter models. It's hard to expect any fan to be quiet when it's whirring along at 4,000 RPM. This fan has all the hallmarks of a noisy, high speed fan. Foremost among them: A high electrical rating (the label reads 0.51A, but Delta's most recent spec sheet claims less) and a chunky center hub with a ball bearing that can stand up to the torque of high speed operation.

Strangely, while our measurements showed the fan spinning slightly below its rated speed, noise and especially airflow were higher than Delta's specifications. We measured the fan's rated airflow at just above 9V. Perhaps Delta's specifications take into account the fact that fans are not typically used in open air?

One thing that surprised us was how much power was required to drive the fan at full speed. Most of the other (slower) fans that we looked at required less than a full watt at full speed, but the Delta ate up almost three and a half watts. Some of this can be attributed to the Delta's higher top speed, but consider this: The two thirds of a watt required to drive the Delta at 3.4V was higher than the 0.57W required to drive the Nexus at full speed and twice the RPM.

The noise from the fan was... noisy. At lower speeds, the Delta clearly lost out in terms of airflow-for-noise. At 5V, it blew as much air as a full speed Nexus but was 4 dBA@1m louder. In the constant airflow test, the Delta was the only fan we tested that we were able to measure above the background noise. The noise at this level was chiefly the sharp clicking that seems prevalent in so many ball bearing fans.

Noise Recordings

SCYTHE KAMA FLOW SA0825FDB12SL

Ambient noise at the time of testing was 19 dBA.

Brand Scythe Co., Ltd. Power Rating 0.09A
Manufacturer Sony? Airflow Rating 19 CFM
Model Number SA0825FDB12SL RPM Rating 1,500±10% RPM
Retail Availability Japan Only Noise Rating 14 dBA
Bearing Type FDB Header Type 3-pin w/ Molex adapter
Hub Size 1.41" Starting Voltage 4.6V
Frame Size 80 x 80 x 25 mm Number of Samples 2
Voltage
Noise
RPM
CFM
Power
12V
22~23 dBA@1m
1570 RPM
24 CFM
0.48W
9V
~20 dBA@1m
1150 RPM
17 CFM
0.36W
7V
<19 dBA@1m
850 RPM
11 CFM
0.28W
5V
<19 dBA@1m
530 RPM
5 CFM
0.22W
@10 CFM (6.1V)
<19 dBA@1m
720 RPM
10 CFM
0.25W
May 5, 2008
The updated airflow results here are the result of improvements in our testing procedures. They are more accurate than the original results above, but they are not directly comparable. Please compare these only with fan reviews published after May 5, 2008 — or ones that have updated results published in a box like this one.
12V
22~23 dBA@1m
1570 RPM
17 CFM
0.48W
9V
~20 dBA@1m
1150 RPM
12 CFM
0.36W
7V
<19 dBA@1m
850 RPM
8 CFM
0.28W
5V
<19 dBA@1m
530 RPM
5 CFM
0.22W

We subjected your ears to a horrible noise in the Delta AFB8012SH, and we're sorry. We hope that this fan will make up for it.

Anyone familiar with Scythe's line of heatsinks knows that Scythe likes to juggle about ten current models at a time. They pull a similar act with fans, with at least four distinct lines. How do they manage to differentiate the various fans? A very good question — one that we're not entirely sure how to answer. Nevertheless, they do carry multiple fan models and this is one of them.

At the time of writing, this particular fan is only available in Japan, under a name that transliterates to "Furou" (???) or, less literally, "Flow". Three different versions are available: Standard, quiet, and super-quiet. Our samples were the super-quiet variety, and we were pleased to note that they did, in fact, seem to be quite quiet. Perhaps these are the retail equivalent of the stock fan that Scythe has shipped with their recent heatsinks?

Aside from being reasonably low noise, this fan's biggest distinguishing characteristic appears to be the use of Fluid Dynamic Bearings, similar to those used in modern hard drives. Scythe's S-Flex line also uses these bearings, and it is possible that our fan is a predecessor to the S-Flex line. FDB is an evolution of the sleeve bearing that provides the lowest noise (according to the manufacturers) and much prolonged life even under high heat conditions. (See the discussion of FDB on page 2 of Anatomy of the Silent Fan.)

This fan is another one to rival the Nexus for noise. It blew a little more air at full speed and spun a little faster to produce it, but the noise character was almost the same: A smooth, low hum that only showed up at around 9V. From our usual listening distance of one meter, we were unable to hear it at 7V and below. So, here it is at last: A worthy competitor to the Nexus that we can wholeheartedly recommend. It even has the FDB advantage of being usable in a variety of positions, not just vertical. Now, if only someone would bring us back a few dozen from Japan...

Noise Recordings

JUMP TO:



Previous 1 2 3 4 5 6 7 8 Next

Fans|Controls - Article Index
Help support this site, buy from one of our affiliate retailers!
Search: