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A couple days ago I received my replacement MB. I put a fresh glob of Shin Etsu 751 on the Megatron, then mounted it to the MB. Then I put my San Ace PWM fan on the Megatron. I noticed it was going around 1600 rpm at minimum and keeping the temps very very low. On a lark, I set the Advanced fan control to 10% PWM (the minimum on my board) for temps at or under 40c. Then I cranked up LinPack on OCCT. CPU0 maxed out at 38c.

Ambient was 17c. Vcore was 1.12v. The chip was running at a nominal 21x133MHz, the default 2.8GHz. I figure that with an ambient of 30c, the cpu won't go much higher than 51c. OK. Went to bed.

Then I got to thinking (always dangerous). I have a 120x25mm San Ace that's rated for 1500 rpm. I wonder . . .

So I did a 25mm fan-off. The contestants:

Gentle Typhoon, 9-bladed ball bearing, nominally 1850 rpm.

Gentle Typhoon, 9-bladed ball bearing, nominally 1450 rpm.

S-Flex F, 7-bladed FDB, nominally 1600 rpm

Slipstream, 9-bladed sleeve bearing, nominally 1600 rpm

Enermax Magma, 9-bladed Twister bearing, nominally 1500 rpm

San Ace 9S1212L401, 7-bladed ball bearing, nominally 1500 rpm

OKGear no-number, 7-bladed sleeve bearing

Masscool FD12025B1L3, 7-bladed ball bearing, nominally 1500 rpm. A $5 fan.

Two dollar "bulk" fan, 7-bladed, probably sleeve bearing, no rpm specs

San Ace 9G1212P4G03 7-bladed ball-bearing PWM fan, nominally 1000 - 4100 rpm (0% to 100%). 60mm diameter motor.

I tested in my basement, where the ambient ran 16.5 - 17c. I will present cpu0 temps less the ambient, for net temps.

Format: fanName|bladeNumber|rpm|netTemp

Arranged warmest net temps to coolest net temps, higher rpm's to lower rpm's within the same temperature group:

OKGear_ | 7 | mid-1500's | 32c
SA-L401 | 7 | low 1400's | 31c
Magma_ | 9 | around 1700 | 30.5c
SFF1600 | 7 | high 1400's | 30.5c
GT-1450 | 9 | mid-1300's | 30.5c
Masscool | 7 | around 1600 | 30c
$2-bulk_ | 7 | low 1500's | 30c
SA-PWM | 7 | low 1500's* | 30c
SS-1600 | 9 | mid-1700's | 29c
GT-1850 | 9 | high 1700's | 29c

Arranged Lowest to highest rpm:

GT-1450 | 9 | mid-1300's | 30.5c
SA-L401 | 7 | low 1400's | 31c
SFF1600 | 7 | high 1400's | 30.5c
SA-PWM | 7 | low 1500's* | 30c
$2-bulk_ | 7 | low 1500's | 30c
OKGear_ | 7 | mid-1500's | 32c
Masscool | 7 | around 1600 | 30c
Magma_ | 9 | around 1700 | 30.5c
SS-1600 | 9 | mid-1700's | 29c
GT-1850 | 9 | high 1700's | 29c

Grouped by blade number, then arranged Lowest to highest rpm:

SA-L401 | 7 | low 1400's | 31c
SFF1600 | 7 | high 1400's | 30.5c
SA-PWM | 7 | low 1500's* | 30c
$2-bulk_ | 7 | low 1500's | 30c
OKGear_ | 7 | mid-1500's | 32c
Masscool | 7 | around 1600 | 30c

GT-1450 | 9 | mid-1300's | 30.5c
Magma_ | 9 | around 1700 | 30.5c
SS-1600 | 9 | mid-1700's | 29c
GT-1850 | 9 | high 1700's | 29c

* The PWM fan's rpm's were barely above 1500.

You get the impression that on the Megahalems, Gentle Typhoons show up better at these gentle temps. OTOH, look at that Slipstream!

When I test at higher temps I will look into graphing rpm vs temps.

In the mean time, look how close they are. Some of these are very cheap. None of these fans clicked the way all of my YL's do. All were quiet at these rpm's. I really couldn't hear the Magma from a meter away with no side panel. YMMV, of course.

====================

2010-03-21

Some more testing. Ambient 17c, as usual.

San Ace 9S1212H401, part of their Silent series. Faster sibling of the L401. Nominal 2500 RPM. Sweet, sweet sounding fan. Just the tiniest hiss at 5v.

San Ace 9S1212F401. Faster sibling of the L401. Ditto, with nominal 2200 rpm.

Slipstream-12SH. Nominal 1900 rpm. A nine-bladed fan.

S-Flex SFF-21G. Nominal 1900 rpm

San Ace 9G1212H101 #2 (just in). Nominal 2600 rpm. Clicks at 5v. 38mm thick.

Results, OCCT 6 reps:

Fan_Name | speed | temp difference

9G1212H101 | 2518 rpm | 29c
9S1212H401 | 2376 rpm | 29c
9S1212F401 | 2045 rpm | 29C
SS-1900 | 1906 rpm | 29.5C
SFF1900 | 1814-1849 rpm | 30C

Vcore was 1.112v, spiking to 1.14v

The Slipstream and the S-Flex appear to have 0.5c better temps than their slower sibs. The San Aces do about 1c better than their 'L' sib.
 

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The differences would probably be wider on a TRUE rev.A, tbh. The Megahalems' fins aren't as close together as a lot of people think. Still, I'd have almost expected these results, nice work.
 
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