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1  Economy / Digital goods / Free Bitmain coupons available on: November 28, 2018, 06:36:00 PM
I have 10 $55 Bitmain coupons which are expiring in 2 days (Nov 30th 2018). Don't need them so I'll send them to the first person who contacts me (privately).


EDIT: Coupons now expired. No takers - even for free. Lol.
2  Bitcoin / Mining software (miners) / Antminer S9/S9i firmware - Full voltage/frequency control - HAS HIDDEN DEV FEE on: August 23, 2018, 04:13:57 AM
Update: So the firmware I posted earlier apparently has a hidden dev fee as pointed out by another user here. Have updated the title accordingly. Works fine though.

Original post:

I recently purchased firmware offering full voltage/frequency control and claiming to have no dev fee from ebay. Sharing it here for those who may be interested.

NOTE: I've used this for about a week now and see no issues on five of my S9's. I can't guarantee that there's no "hidden" dev fee but prima facie - there doesn't appear to be any.


What I achieved:
1) Consistent reduction in voltage consumption by 15% or so. About 150w per miner give or take.
2) A marginal reduction in hash rate too. I was averaging about 14 TH/s per miner per day using standard bitmain firmware. With this firmware, though there is a reduction in power consumption, my hashrate is about 13.85 average over 7 days.
3) Note that my intention was NOT to overclock. I just wanted to reduce power consumption. OVERCLOCKING IS DANGEROUS. USES MORE THAN 1600W SO YOU'LL NEED MORE POWERFUL POWER SUPPLIES.

First download link from - free account so download rate limited:!mbxSBCxR!gAcTMktLj94PoubgELS8nuqga84Lb1VnoYLVF9FuWjg

Second download link from Google drive:

Some screenshots:

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