Topic: [ANN] Technobit HEX8A1 -240 GHs Coincraft A1 board- Finished production - page 31. (Read 72425 times)

As zich said you are golden

Your reject ratio only 0.095%
That's not high but super low

I have a question.

I have ~0.01% HW errors, but my Rejects or Refuses are quite high.



How can I get rid of them? Do I use the wrong clock setting?
Does this cause my variable btc reward at my pool, because normally it was really stable.

Look like the voltage stand on 800mv even with 1000mv setting.

Actually my board also had same broken capacitor leg but cause by my self  .
But i just join it with his friend there( the one you point by single red arrow)

Yeah, I figure out when powering 6x Hex16b, if you use a power protected hub, multiple PSU works fine.

I noticed some lose PolyFuse legs on this bad Hex8A1. Maybe they got broken in packing or shipping but the one on the right looks like a horrible solder joint. Not sure if this would stop it hashing though. I'm not an expert at electronics. Wish I was!

I see, so different PSU on one host.

The Hex16b's are on 2x 350W PSUs.
Only the Hex8A1 have been on the Thermaltake 730W

Anyway, one last try, put problem child on the Thermaltake alone, has both PCI-E power cables. I tried 100/1000 and default 260/1000 and 1/0...

...but it seems to be dead for good now. How does one get Marto to fix this?

I'll leave it disconnected overnight and see if it works in the morning, but has been a problem all day since it arrived. I think it's a DOA.
What does the orange LED mean?

Maybe you can try one board only with 260/1000 setting without other HEX16B and set "Hex8A1 Set ASIC difficulty to one" : "0".

You had:
 6 HEX16B x 5 A  = 30 A
 2 HEX8    x 17 A = 34 A set at 200/870

Total 64 A X 12 V = 768 watt

So i guess your PSU can not deliver the power required by the board

Thanks for the delivery, Marto.
The fans are really noisy, I replace them with low CFM and quiet ones,
and run the HEX8A1 with only 175 in frequency and 870 in voltage parameter.

When connected to Linux machine, lsusb will show:
Bus 001 Device 017: ID 04d8:000a Microchip Technology, Inc. CDC RS-232 Emulation Demo

And it appears as a tty device:
crw-rw---- 1 root dialout 166, 1 2g  16 08:51 /dev/ttyACM2

Showed in dmesg:
[  161.103406] cdc_acm 1-1.1:1.0: This device cannot do calls on its own. It is not a modem.
[  161.103442] cdc_acm 1-1.1:1.0: ttyACM2: USB ACM device

Running with cgminer:

While I also run bfgminer with other mining hardware, it seems bfgminer could cause the OS to hang when it probe the tty device.
This can be avoided with run HEX8A1's cgminer first (so the tty device would disappear), or plug the HEX8A1 after bfgminer runs.

Oh, and it runs well with p2pool, with less than 2% DOA, compared to 5~6% DOA for BFL or BitFury devices.

One of my Hex8A1 miners has a habit of crashing then it's really difficult to bring it back up.
I suspect it don't like running at 220/880 or any other low voltage.
It takes out both miners and the PSU. It could be the PSU I guess but they are running < 250W each and it's single rail 684W so something wierd going on.
Any tips? I'm guessing more volts less clock? But why should the fact it crashed make it hard to get booted again?
I thought it was dead, but it came back once, and now it's dead again.


Rebooted and only one miner comes back. Fans spin but heatsink stays cold.
Is it broken? Why does CGminer say 800mV when it should say 880mV? Could it be a software bug?
I've never had a miner act like this before. Help!

So I reset default 260/1000 rebooted again and now both Hex8A1 are MIA!
Fans are spinning, one board shows green+green light, the other show green+amber light.
Maybe I'm just asking too much from the PSU here, so lets try a lower volt again.


Ok so I try 200/900 and reboot again. The green+green light one starts hashing. Although it doesn't flash the lights like the Hex16B do.
It's all so random!


So I unplug the bad one and CGminer detects that, not mining seems to be a different state than not connected/powered.
Sadly when I plug it back in it still refuses to mine with it.

In to link web it is called set asic difficulty or something like that for hex8 boards. Default is 0 change this to 1

How u change it? I'm in no rush though, I run it until they stabilize. 

Gator,
While tweaking the boards use diff to one 1 . With dif to one 0 you need at least day for stats to settle
Then you can which board is better

-

Okay this is the result of underclocking to 200/870 both running on the same PSU now...


384.9GH for 434W measured at the wall.
0.89GH/W or 1.12W/GH

One board is a fair bit weaker than the other. One is slightly warmer and they have different capacitors, although all flat ones.

Time to try the quiet fans, I'm getting a headache!  

Nice pics gator.  The diff-to-one is 0 which is a wise move having in mind other boards connected

Hi
All
This weekend we are off
Will be back in monday

Ok bought a 730W Thermatake as a temp PSU had 4x PCI-E. It's not enough to run 2x Hex8A1 on defaults clocks! Not 1GH/W @ 260GH!

Hex8A1 #1 (Good Girl) Default Clock/Volt 245GH 368W at the wall.


Hex8A1 #2 (Bad Boy) Default Clock/Volt 248GH 408W at the wall. 40W more!


Total = 493GH @ 776W
0.63GH/W or 1.57W/GH that's very similar GH/W to the Hex16B except they're not as quiet!

Right I'm gonna dial the clocks down and see if I can get close to 1GH/1W somewhere so I can run both on the same PSU.  

Then I'm gonna try and make them quiet!

700W 80+ PSU ... checked
TL-MR3020 ... checked
Router patched with latest firmware ... checked
USB power-protected hub ... checked
Fan protection for cat's nose ... checked
HEXA81 board ... che ... Wait wait!!
...
Houston, we have a problem.

Martin, please, where is my board ? Order EJYKOZQDX, still "Preparation in progress"... Can i have the shipping number please ?

I wish I was, but Marto never sent me mine, and now he won't even talk to me.