GekkoScience Compac BM1384 Stickminer Official Support Thread

[zOU]

And you made sure that the hub they're plugged in has sufficient power to run 4 at 240Mhs ?

[irritant]

And you made sure that the hub they're plugged in has sufficient power to run 4 at 240Mhs ?

it was running fine with 4 sticks looking at the screenshot, 5 sticks are doing fine, so yeah im also guessing too much power draw to feed the last two?

[cavaliersrus]

i would say that is what is going on with your sticks is that your hub is dropping off on the last ports that your plugging into do you have a kill a watt meater or a way to measure the voltage of your hub's power draw

[zOU]

Well, 5 on a hub may work, but I think Y cables are a must if ports are strictly limited to 500/900mA.

Unless he has a fancy hub that just doesn't care in this case, maybe the power supply is undersized.

I run 3@330Mhs on a 7 ports USB3 hub with Y cables.
The hub has a 12V-2.4A PS.

[Biodom]

Well, 5 on a hub may work, but I think Y cables are a must if ports are strictly limited to 500/900mA.

Unless he has a fancy hub that just doesn't care in this case, maybe the power supply is undersized.

I run 3@330Mhs on a 7 ports USB3 hub with Y cables.
The hub has a 12V-2.4A PS.

I thought that at 330mhz (i assume ~750-760mv) you should be at much less than 2.4A/slot, hence no need for Y on your particular hub (which sounds like Superbpag).
Of course, Ys would not hurt.

[zOU]

I thought that at 330mhz (i assume ~750-760mv) you should be at much less than 2.4A/slot, hence no need for Y on your particular hub (which sounds like Superbpag).
Of course, Ys would not hurt.

I can't get the superbpag in EU as it doesn't have the required certifications.

I'm using 2x TP LINK UH700
Since USB3 has a 900mA limit per port, anything over 250Mhs should require more than 900mA (as per bitmain BM1384 datasheet, the chip uses 4.62W@250Mhs (5V x 0.9A = 4.5W)) (and that's not counting the other stick component power usage), hence that's why I'm using Y cables.




My 6 sticks are using between 2.1 and 2.3A (which is already more than the 0.9Ax2 that they should be allowed to get, but apparently this switch doesn't enforce the 900mA/port very strictly so it could work without Y cables. But I have them so I use them ;p )

So I find the "Current(A)" column above quite confusing....

[Biodom]

I thought that at 330mhz (i assume ~750-760mv) you should be at much less than 2.4A/slot, hence no need for Y on your particular hub (which sounds like Superbpag).
Of course, Ys would not hurt.

I can't get the superbpag in EU as it doesn't have the required certifications.

I'm using 2x TP LINK UH700
Since USB3 has a 900mA limit per port, anything over 250Mhs should require more than 900mA (as per bitmain BM1384 datasheet, the chip uses 4.62W@250Mhs (5V x 0.9A = 4.5W)) (and that's not counting the other stick component power usage), hence that's why I'm using Y cables.




My 6 sticks are using between 2.1 and 2.3A (which is already more than the 0.9Ax2 that they should be allowed to get, but apparently this switch doesn't enforce the 900mA/port very strictly so it could work without Y cables. But I have them so I use them ;p )

So I find the "Current(A)" column above quite confusing....

yeah, i thought so, smoke 'em if you got 'em, why not?
superbpag also have 2.4A slots and 10 slot Anker (this one not for pi, but works on linux machine; usb 3.0) has 0.9 A/slot, so Ys there are certainly advisable.

What is the fastest sustained speed you were able to get?
I had a 12hr run at 24.07Gh/s average, but now decided to ease up. However, there was almost no errors up to 425mhz, but between 425-435 mhz errors started to accumulate a bit. I am quite curious if speeds above 25Gh/s are possible in a sustained run and measured in cgminer/bfgminer (correctly).

[user356546]

I was running the CPU on my system at 100% and noticed that my 4 sticks dropped their hash rate significantly. Going from an Average of 75 GH/s down to 50. When I stop the task, the hashing goes right back up again. Is this normal behavior inside of windows with cgminer?

[sidehack]

Is it normal for a program requiring processor time to slow down operation when a different program has the processor pegged? That sounds about right.

[zOU]

My 3 computers supporting asics always have their CPU @ 100% use all time.
(they're running Boinc)
I've not noticed any impact on hashing, but it's an interesting point, I will check in the morning

[user356546]

Is it normal for a program requiring processor time to slow down operation when a different program has the processor pegged? That sounds about right.

Cgminer is only running about .2% CPU utilization on average one core. When fully maxed out not only do I see degradation in hashing but also increase in Zombies and cgminer going not responding. I understand there could be an impact but I did not expect to see so much. I was just asking if others were seeing the same.

[sidehack]

To some extent it probably depends on the OS process scheduler, USB interface interrupt handling, capability of the CPU itself and some other stuff. I've seen cgminer on some embedded systems peg the processor by itself.

[jstncheney]

Well, 5 on a hub may work, but I think Y cables are a must if ports are strictly limited to 500/900mA.

Unless he has a fancy hub that just doesn't care in this case, maybe the power supply is undersized.

I run 3@330Mhs on a 7 ports USB3 hub with Y cables.
The hub has a 12V-2.4A PS.

Could you link me to a reliable Y cable please?
Thanks zou!

[sidehack]

Oh by the way, second run sales queue is now open.

[zOU]

That's the one I use:

http://www.ebay.fr/itm/221661361513?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

[Morguk]

Read though a few of these threads but can't find a clear answer.

What's the best way to power 4 of these at around 15GH each? From what I understand I need a hub that can output more than 500ma? If so how much more?

Are there any cheaper decent hubs available or can I just use a Y cable and a bog standard hub?

[zOU]

500mA is the USB2 norm
900ma is the USB3 norm

Not all switch strictly enforce it

[Morguk]

Is 900ma enough for 15GH?

So just get a decent USB 3.0 powered hub?

Should work with an original Pi B right?

[drew_ii]

Is 900ma enough for 15GH?

So just get a decent USB 3.0 powered hub?

Should work with an original Pi B right?

Negative for the PI Zero, but I just got a 2B so I can try that, but I'd wager not on a flat B either.  This link is all about how 3.0 doesn't work, and some complain 2.0 doesn't work properly either (but it works fine for our interests):
https://www.raspberrypi.org/forums/viewtopic.php?t=74695&p=535407. 

For a Zero you have to cascade the 3.0 through a 2.0 to the PI, so the PI only sees the 2 and the 2 downgrades the capability of the 3 from 3 speeds to 2 speeds - so while 3 gives you the ma you need to power the sticks up without Y's, the 2 makes it so the PI can talk to the sticks.  I don't think that the USB bandwidth downgrade makes much difference as the data is pretty small all in all - you're just looking for the power.

Oh, and the Anker 70w won't work - Look for the Superbpag if possible.  Anker by itself, through a powered 2.0, or through an unpowered 2.0 just doesn't work.  Anker is aware of it and says there's no resolution, so I had to get a refund.

Superbpag here (they were low on stock before but seem to be full up again)
http://www.amazon.com/Superbpag-Portable-Charger-Transfer-Samsung/dp/B013OK10YM/ref=sr_1_2?ie=UTF8&qid=1452598444&sr=8-2&keywords=superbpag

[jstncheney]

That's the one I use:

http://www.ebay.fr/itm/221661361513?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

So you just plug the existing usb cord coming up from the power usb hub, to the Female end and the male ends into the computer?