Hi Dave,

Happy (belated) Thanksgiving!

I received my RMA the other day.. thanks for that! I have a slight problem though. While waiting on the RMA request, I have found 3 more H cards that are likely bad.. they drop to 0 Gh shortly after starting the rigs.

They weren't acting up like this at first, but I feel like it wasn't my fault. I have had two box fans and two 120mm fans blowing air on them, and I also have an A/C that keeps the room under 74 degrees. I also have some electrical tape holding the cards in place, so I do not think the loss in Gh is due to them wiggling free from the fans either.

I was wondering if I would be allowed to RMA these cards as well? It would certainly be much appreciated.

Thanks,

Ch

I had this problem and it was from card wobble.  Problem solved by jamming packing peanuts between cards at the end (be careful not to obstruct airflow).

Now I'm golden 24/7

Just debugged a board with 4 dead chips!

a) replace chip 1 with chip2, no fish, frustration level 1
b) replace chip 1 with chip3, no fish, frustration level 10
c) replace chip 1 with chip4, no fish!, scratch head, solder external power supply, frustration level 1000+
d) finally replace chip 1 with chip5, and the chip worked! 4 dead chips in a row, starting from chip1.

Yup, it's coil whine

 Running into a similar problem myself One of the RMA'd h-boards runs fine for about 5 minutes, and then starts creeping down to 0 before it dies. Restarting the miner gives it some more life until it gives up again. Forcing everything to 52, have two fans on ensuring everything is cool... strange. This gear is very... temperamental

 Was running fine for a week and suddenly starting dying on me today Will continue troubleshooting :|

Edit: Yep, troubleshot some more. An H-card went flakey on me sometime today If I stick the single flakey board in slot 0, it makes the m-board think there are 4 boards plugged in throwing massive errors. If I stick a working board in slot 0, and the flakey board in slot 1, slot 0 (good board) will eventually go to 0GHs and die completely, while the flakey board in slot 1 will hash at around ~30GH/s. If I throw the flakey card in slot 1 by itself, with nothing in slot 0, it doesn't work at all. I give up.

Edit2: More troubleshooting, put the unit on it's side, built a support structure out of Lego (cards slide into grooves on a long flat green lego board), and managed to Frankenstein the two cards to be stable @ ~30GH/s each. Very very strange *shrugs*

Edit3: Heh.

yep THIS...i made a tension bridge out of clear tape  that pulled cards left or right (depending on side of board).   Do not put too much tension on the cards, but just have enough so they will not move when the air cools them.  GH/s much stable now.

Seriously, packing peanuts jammed between the boards.  Mine have been running for almost two weeks now without interruption

he's off doing whatever is going on with the 100Th (350TH) mine, which apparently lost its hot and cold wallet accounts this past week?

PS: I am still waiting to get or use my 2.25BTC in store credit. Its getting a bit weird now that im not getting any reply as to how/when i can receive it ro my wallet or be allowed to use it on hardware that isnt for sale...

Anyone knows where I could still get some bitfury chips?

Thanks!