Re: ANTMINER S3 Discussion and Support Thread.

Observation.
In one of the Batch 4 machines I got, there is a machine with a July 28 firmware date within the Kernel Log.

Anyone noticed that? Is that an experimental firmware?

The cooling fans report constant 7000-9000 RPM range. That doesn't look normal. Recommendations?

Got my B4 S3's today. Both of them have also the July 28 firmware ("Linux version 3.10.12 (xxl@ubuntu) (gcc version 4.6.4 (OpenWrt/Linaro GCC 4.6-2013.05 r38031) ) #140 Mon Jul 21 17:27:04 CST 2014").
Both of them run with very high fan speeds, much higher than the B1 units

3780 3960
4680 10560

The B1 units, at freq=225 run 1740 1620 and 1680 1500 rpm

The Bitmain support page does not mention this firmware. Any clues why the high fan speed?

I'm now getting fan speeds of ~14000, it 'sounds' like a software bug more that a super-sonic fan.... (the fans on the new B4 units sound similar to the older B1 units with the July 21 firmware) - BITMAIN what is happening with this July 28 firmware on the Batch 4 Antminer S3s?

Cheers

Batch 4 Antminer S3 seems more stable than the Batch 1 to 3.
I think the manufacturer purposefully did this. Else there is no reason to have a higher fan speed.
Don't forget to take a backup of your firmware before doing any update.
since, the current so called different firmware is not available in bitmaintech website.
Any one here with B4 S3-es having lower fan speeds below 2000? Also post your ambient and clockspeeds.