Is anybody else getting those crazy spikes out of c-scape's 16 bitfury card power supply? Guess this is why my chain is highly unstable, the length is detected randomly and sometimes even not detected at all...



Any help appreciated!

Thanks

Yeah, 12.000V stable and no ripples, it's very strange, maybe some parts of the TPS are damaged/broken?

Or in the (over)current sense resistors. I assume the resistors are all unmarked ?

The 5 parallel resistors on the back are (counting from corner): 220k, 147k, 187k, 220k, 100k. Did they put silk screen on the back ?

Pretty sure it's a software problem.

Switched from cgminer to chainminer, and now I'm seeing >18GH on seven chips!

+1

Have you approached any companies yet?  This looks pretty special to me

Fantastic work on those boards by the way.

I think I have a bad chip.  It was acting strangely when I was testing cgminer hashing one chip at a time, reporting between 500 and 1500MH where all others were >2.5GH.

Now that I'm on chainminer, I just repopulated that chip on the board, and this seems to confirm it's marginal:


1       AIfDSo  54      2.803   2.430   109     75      0       1       128     [0:0]   663     7 7 5 6 7 7 7 8 7 6 7 8 8 6 7 6         0 2 5 2 3 3 1 5 8 5 7 6 7 11 10 0
2       AIfDSo  54      2.906   2.582   113     96      0       0       136     [0:1]   662     6 6 7 7 6 7 7 8 8 7 8 6 8 8 8 6         0 0 1 3 4 4 3 5 9 8 8 10 12 15 14 0
3       AIfDSo  54      2.340   2.620   91      56      0       0       138     [0:2]   675     5 6 6 7 6 6 5 6 3 6 5 7 6 5 6 6         1 0 0 0 3 4 5 4 6 3 4 3 7 8 8 0
4       AIfDSo  54      2.829   2.373   110     27      0       0       125     [0:3]   662     7 7 8 8 7 6 6 6 7 8 5 7 7 7 7 7         0 0 0 1 1 1 2 3 0 0 3 3 4 4 5 0
5       AIfDSo  54      2.726   2.506   106     72      0       0       132     [0:4]   675     6 6 6 7 6 7 7 8 6 8 8 7 6 6 7 5         0 1 4 4 3 4 1 4 8 5 7 6 7 9 9 0
6       AIfDSo  54      2.083   2.449   81      46      0       0       129     [0:5]   684     5 5 5 5 5 4 5 5 5 6 6 6 4 5 5 5         0 0 0 0 0 1 1 3 3 3 5 9 7 7 7 0
7       AIfDSo  54      2.495   2.430   97      120     0       0       128     [0:6]   669     5 6 6 6 7 6 7 5 7 7 6 6 6 7 6 4         1 2 2 3 1 5 5 9 10 14 14 11 13 15 14 1
8       AIfDSo  54      0.617   2.430   24      156     0       0       128     [0:7]   735     0 2 1 3 3 2 2 0 1 2 2 0 2 0 2 2         3 1 8 12 12 14 15 18 13 7 7 16 14 9 6 1
speed:432 noncerate[GH/s]:18.800 (2.350/chip) hashrate[GH/s]:19.823 good:731 errors:648 spi-errors:0 miso-errors:1 jobs:145 (record[GH/s]:0.000)
0:      432     18.800  19.823  731     648     0       1


I don't understand what all the stats mean yet, but chip #8 is the one I suspected as bad.

It was announced here: