Quote from: jlsminingcorp on October 29, 2013, 07:03:31 PM

Quote from: wrenchmonkey on October 29, 2013, 03:01:36 PM

Quote from: jlsminingcorp on October 28, 2013, 10:17:26 PM

Hi All, you'll be pleased to know that the last four H-boards arrived late this afternoon and are now hapily hashing away Grin

(all GB members now have their shares hashing). As with the other boards I'm going to give autotune a chance to work its magic before hand tweaking the chips individually tomorrow. Unfortunately we've got some dead/dying chips in these new boards too (6 in total across all the boards), but the remaining chips should be able to compensate fairly well for this. The BFSB miner is currently running at between 188 and 192 GH/s (280 W at the wall), with some hand tuning I'm hoping to get closer to 200 GH/s, but we'll see.

DOA chips? That doesn't sound promising. Have you contacted the manufacturer to see if there are any remedy options for us?

Some chips are just poor performers/DOA on these boards. The chips are not tested and binned, so each board/miner gets the luck of the draw. The bitfury threads have lots of examples of boards that have worse issues, so I think we've done OK. I haven't contacted BFSB about this. They are all hashing between 30 and 35 GH/s, so considerably faster than the 25 GH/s advertised, so BFSB have certainly delivered what they promised. Also, if we were to RMA a board (and if they were to accept it) then the best case scenario is that we loose min 1 week to ship a new board out. I don't think this is worth it. If others do then we will investigate the possibilities, but my feeling for the moment is that this isn't really a problem. The boards are sort of self-healing - if one chip is not performing well then the others seem to pick up the slack - maybe they get some extra voltage because of a bad chip?

Don't go chasing a few GH when were over performing, yea you might get a few more ghs but when were down for a week+ and then the next difficulty hits that few ghs will be meaningless and it would have been more worth it to just stay with what we had.