Re: Bitmain's Released Antminer S9, World's First 16nm Miner Ready to Order

Hi I have received two units of S9 and both have one board hashing around 2.7

They are batch 2, is it a normal? Any tips?

Thanks!

As others have said try lowering the freq. I have one board which underperforms as well. If I do a 'save and apply' without changing anything, sometimes it will come up good (higher hash) and sometimes it will come up bad (lower hash). But lower freq usually means better odds of it coming up good when I restart cgminer. I can tell within a minute if it got a good start because it will either come up past 3000 or it wont by that time.

I've got it working with the mysterious "low voltage" firmware from June 22nd. I had to lower the frequency to 593 and reboot quite a few times but now I got it running at 12.6 TH stable, with the slow board around 4000Gh, I guess this is as good as it gets.
I'm wondering if using an alternative PSU to my bitmain one would improve, I will try to borrow one to test.

Yeah I misspoke (misstyped) on my previous post. It'll hit 4000 within a minute if it gets a good restart, not 3000 as I had stated before. I get 12.6 also but I am running at 587. I thought about trying the mystery firmware but opted not to until I hear more results. My slow board will push 4150 or so after a good restart at 587. The thing is the other boards will do 4300 easy with higher freqs, but if I do that the slow board just gets stuck around 2700-2800 (like your screeny). I may well try swapping boards when my B4 arrives to see if I can build a higher freq unit and lower freq unit.

I would contact them before switching boards between unit's. It's would break the warranty seal and be a shame to lose warranty on two pretty new unit's over a little bit of hash.

Have you contacted them and said it did not fall in "12.93TH/s ±5%" of batch 2? If not do that before breaking seals and voiding warranty.