Avalon fans

[smoothrunnings]

Has anyone taken pictures of their batch 2 Avalon facing the fans and could share it with me (full rez?). I have a Batch 1 Avalon and Fan 1's speed isn't adjustable, so I would like to replace it with like that is used in the batch 2 Avalon's, plus I want to check and see if fans 2 and 3 are the same as in batch 2.

Thanks.

[StringTheory]

Don't have any pictures on me currently, but the fans were the same throughout all of my Batch 2 units.  I did end up swapping out the fans for aftermarket ones before moving them into colocation.

[smoothrunnings]

Don't have any pictures on me currently, but the fans were the same throughout all of my Batch 2 units.  I did end up swapping out the fans for aftermarket ones before moving them into colocation.

What fans did you end up switching them with?
I have a batch 1 Avalon, I was thinking of changing the PC with something the system can control which is why I asked.

[AdamKD]

https://bitcointalk.org/index.php?topic=155872.msg1651925#msg1651925

if you want to replace the fan, please use ONE 12038(or 12044) size, 4PIN PWM, 12V , with at least 3600RPM maximum speed.  ball bearing is recommend.

a 1200rpm 12025 fan (or 2 in series ) will of course kill the machine.

For future reference those number are decoded as:

"If you want to replace the fan, please use ONE 120mm x 38mm (or 120mm x 44mm) size, 4PIN PWM, 12V , with at least 3600RPM maximum speed.  ball bearing is recommend.

a 1200rpm 120mm x 25mm fan (or 2 in series ) will of course kill the machine."

That's Avalon recommended.  You can use less powerful fans as long as the room ambient temperature is low (say, the same as in a server room) and you are using the standard Avalon case or an Aluminum one where heatsinks are directly mounted to Aluminum base.  If you're using a design where the heatsink is NOT directly mounted to an aluminum base you're very limited with your overclock ability.  There's a good reason why the Avalon heatsinks are mounted to the aluminum base.  The base increases heatsink surface area and, accordingly, acts like a heatsink drawing heat from actual heatsinks.

If you want to save money don't use a 4 pin PWN fan but use a 3 pin non PWN fan.

Also, see:  https://bitcointalk.org/index.php?topic=253382.0

(Google search:  http://bit.ly/1c5kjUG)