ASICMiner USB group buy- orders closed, pay for extra! - page 54.

SilentSonicBoom

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So does this hub http://www.amazon.ca/Adapter-Anker%C2%AE-Uspeed-Button-included/dp/B005NGQWL2/ref=sr_1_15?ie=UTF8&qid=1369673158&sr=8-15&keywords=usb+3+hub run 10 usb miners at full power with a fan to keep them cool? What are your thoughts on this one at http://www.amazon.com/Satechi-10-Port-Port-iPad-Charging/dp/B00B9KOCYA/ref=zg_bs_281413_23 which states 5V5A? Can 9 be safely run? Which one would be better? Thanks for your help.

Quote from: af_newbie on May 27, 2013, 12:17:30 PM

Quote from: LazyOtto on May 27, 2013, 12:10:13 PM

But, on second thought, looks like the first one actually might power up to 19 devices.

Assuming 100% efficiency of converting 12v to 5v.

And, that I did the math correctly to convert 12v4A to 5v9.6A.

What math?

The monoprice has 4A@5V power supply.
The anker one has 4A@12V power supply.

What is your point? Other than to disagree with yourself?

Quote from: LazyOtto on May 27, 2013, 11:58:32 AM

Quote from: af_newbie on May 27, 2013, 11:53:33 AM

USB 3.0 might be a better way to go

Irrelevant.

The USB miners will (I assume) self identify as USB 2.x devices. As such, the hub, if properly designed, will limit each device to 500mA. Which isn't the problem. Aggregate power draw is the issue.

That other hub you linked has the same constraint of 4A max. Same power envelope as the first one. Seven miners max. And the form factor looks far less conducive to cooling.

The anker one should deliver ~960 mA to each USB port.

Anyway, anyone run 10+ Erupters?

af_newbie

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Quote from: LazyOtto on May 27, 2013, 12:10:13 PM

But, on second thought, looks like the first one actually might power up to 19 devices.

Assuming 100% efficiency of converting 12v to 5v.

And, that I did the math correctly to convert 12v4A to 5v9.6A.

What math?

The monoprice has 4A@5V power supply.
The anker one has 4A@12V power supply.

What is your point? Other than to disagree with yourself?

Quote from: LazyOtto on May 27, 2013, 11:58:32 AM

Quote from: af_newbie on May 27, 2013, 11:53:33 AM

USB 3.0 might be a better way to go

Irrelevant.

The USB miners will (I assume) self identify as USB 2.x devices. As such, the hub, if properly designed, will limit each device to 500mA. Which isn't the problem. Aggregate power draw is the issue.

That other hub you linked has the same constraint of 4A max. Same power envelope as the first one. Seven miners max. And the form factor looks far less conducive to cooling.

The anker one should deliver ~960 mA to each USB port.

Anyway, anyone run 10+ Erupters?

LazyOtto

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Activity: 476

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Quote from: af_newbie on May 27, 2013, 12:46:27 PM

Quote from: af_newbie on May 27, 2013, 12:28:55 PM

... The monoprice has 4A@5V power supply. ...

Look at of the images, it has a picture of the power supply.

Thank you.

Yep, that's hard data that the monoprice hub cannot support it's 24 ports at full USB 2.x spec.

I guess it'll all come down to the dimensions of the USB Eruptors.

If they are thin enough to leave a sufficient gap between them on a given 'inline' USB hub, then a single 120mm fan running at low speed would suffice to keep them cool enough.

IMO / the bet I would make.

ASICMiner has not posted the physical dimensions as part of the published specifications. That I can find.

Guess we'll just have to wait until we have them in hand or someone is kind enough to measure theirs and post the numbers.

LazyOtto

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Quote from: af_newbie on May 27, 2013, 12:46:27 PM

Don't forget Kano, he has one.

Yep, I forgot Kano.
Mustn't do that. Cheesy

LazyOtto

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Quote from: af_newbie on May 27, 2013, 12:28:55 PM

... The monoprice has 4A@5V power supply. ...

Where did you find that 4A@5V spec, please. I can't find it on the monoprice page.
That would be underpowered for a 24 port hub.

My bet is that it, also, has a 4A@12V power supply. If so, I would much prefer the monoprice over the anker due to the form factor for cooling.

Quote from: af_newbie on May 27, 2013, 12:28:55 PM

Do you have any Erupters running? I was wondering how much heat they generate. Do I need to worry about external fans to cool them down?

No. No one but friedcat and arklan have any running so far.

Report from friedcat is that they can overheat and stop running. But they recovered OK after cooling down. (And he may have done that test on one without a heat-sink. I don't recall.)

IIRC, arklan reported that they ran "too hot to touch" with pure passive cooling. After adding a small, I presume, fan they ran at a 'reasonable' to the touch level.

LazyOtto

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Quote from: af_newbie on May 27, 2013, 12:17:30 PM

Quote from: LazyOtto on May 27, 2013, 12:10:13 PM

But, on second thought, looks like the first one actually might power up to 19 devices.

Assuming 100% efficiency of converting 12v to 5v.

And, that I did the math correctly to convert 12v4A to 5v9.6A.

What math?

The monoprice has 4A@5V power supply.
The anker one has 4A@12V power supply.

What is your point? Other than to disagree with yourself?

Quote from: LazyOtto on May 27, 2013, 11:58:32 AM

Quote from: af_newbie on May 27, 2013, 11:53:33 AM

USB 3.0 might be a better way to go

Irrelevant.

The USB miners will (I assume) self identify as USB 2.x devices. As such, the hub, if properly designed, will limit each device to 500mA. Which isn't the problem. Aggregate power draw is the issue.

That other hub you linked has the same constraint of 4A max. Same power envelope as the first one. Seven miners max. And the form factor looks far less conducive to cooling.

"What is your point? Other than to disagree with yourself?"
My point, is to have a factually correct discussion.

Thank you for pointing out that I didn't notice the 4@5 versus 4@12 difference between the two units. My mistake.

"What math?"

Watts = Volts X Current (Amps)

If we stick with the same units, the monoprice claims 4A@5V. That spec will power 8 (minus overhead) miners.

If we must convert, for the anker at 4A@12V we must convert that that to xA@5V.

Solve for x.

-- edit

Which is what you did in order to agree with me: "The anker one should deliver ~960 mA to each USB port."

af_newbie

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Quote from: LazyOtto on May 27, 2013, 12:04:23 PM

Quote from: af_newbie on May 27, 2013, 12:02:32 PM

12V, 48W

"[12V 4A Power Adapter]"

The power supply I listed, is 4A@12V or 48W on the secondary, it has more than enough juice on the 12V side, it should power the ~2.5W+ each erupter is consuming.

Has anyone actually measured power consumption of the Eruptor? How much current does it draw?

LazyOtto

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Quote from: TiuraZ on May 27, 2013, 12:10:37 PM

Quote from: LazyOtto on May 27, 2013, 12:06:01 PM

Quote from: TiuraZ on May 27, 2013, 12:03:16 PM

It's not 0.5 Amps per miner, it's 0.51 Watts. Cool

I'm afraid you are mistaken.

"500-510mA (sapphire)"
https://bitcointalksearch.org/topic/m.2223927

0.51W/5V=0.102A

Where does that "0.51W" come from?

TiuraZ

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Quote from: LazyOtto on May 27, 2013, 12:06:01 PM

Quote from: TiuraZ on May 27, 2013, 12:03:16 PM

It's not 0.5 Amps per miner, it's 0.51 Watts. Cool

I'm afraid you are mistaken.

"500-510mA (sapphire)"
https://bitcointalksearch.org/topic/m.2223927

0.51W/5V=0.102A

LazyOtto

sr. member

Activity: 476

Merit: 250

But, on second thought, looks like the first one actually might power up to 19 devices.

Assuming 100% efficiency of converting 12v to 5v.

And, that I did the math correctly to convert 12v4A to 5v9.6A.

LazyOtto

sr. member

Activity: 476

Merit: 250

Quote from: TiuraZ on May 27, 2013, 12:03:16 PM

It's not 0.5 Amps per miner, it's 0.51 Watts. Cool

I'm afraid you are mistaken.

"500-510mA (sapphire)"
https://bitcointalksearch.org/topic/m.2223927

af_newbie

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Merit: 1468

Quote from: LazyOtto on May 27, 2013, 11:58:32 AM

Quote from: af_newbie on May 27, 2013, 11:53:33 AM

USB 3.0 might be a better way to go

Irrelevant.

The USB miners will (I assume) self identify as USB 2.x devices. As such, the hub, if properly designed, will limit each device to 500mA. Which isn't the problem. Aggregate power draw is the issue.

That other hub you linked has the same constraint of 4A max. Same power envelope as the first one. Seven miners max. And the form factor looks far less conducive to cooling.

12V, 48W

LazyOtto

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Quote from: af_newbie on May 27, 2013, 12:02:32 PM

12V, 48W

"[12V 4A Power Adapter]"

TiuraZ

member

Activity: 101

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It's not 0.5 Amps per miner, it's 0.51 Watts. Cool

af_newbie

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Quote from: LazyOtto on May 27, 2013, 11:48:32 AM

Quote from: af_newbie on May 27, 2013, 11:23:22 AM

Should be good for 8-10 erupters. Power supply delivers 4A@5V

Why do you say "8-10" rather than 7-8?

0.5A x 8 = 4A. And some margin should be left for general overhead.

Safe estimate looks like 7 to me.

Sure.

USB 3.0 might be a better way to go, something like:

http://www.amazon.ca/Adapter-Anker%C2%AE-Uspeed-Button-included/dp/B005NGQWL2/ref=sr_1_15?ie=UTF8&qid=1369673158&sr=8-15&keywords=usb+3+hub

Not sure how much they heat up. Would spacing them like in the above Anker hub be ok? Anyone has any experience running 10+ of these things?

LazyOtto

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Activity: 476

Merit: 250

Quote from: af_newbie on May 27, 2013, 11:53:33 AM

USB 3.0 might be a better way to go

Irrelevant.

The USB miners will (I assume) self identify as USB 2.x devices. As such, the hub, if properly designed, will limit each device to 500mA. Which isn't the problem. Aggregate power draw is the issue.

That other hub you linked has the same constraint of 4A max. Same power envelope as the first one. Seven miners max. And the form factor looks far less conducive to cooling.

-- edit

But, IMO, anyone looking to run large quantities (greater than three or four) of these USB miners is "doing it wrong".

At ten you've shelled out 20btc for 3gh/s. Just pay 50btc for a 12gh/s blade.

LazyOtto

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Quote from: af_newbie on May 27, 2013, 11:23:22 AM

Should be good for 8-10 erupters. Power supply delivers 4A@5V

Why do you say "8-10" rather than 7-8?

0.5A x 8 = 4A. And some margin should be left for general overhead.

Safe estimate looks like 7 to me.

-- edit

But on the general quality of the device, IIRC I did see these recommended in the Cairnsmore (CM1) thread as being successfully used, and solving problems when other hubs were used, to connect twenty CM1 devices. (Of course, the CM1 doesn't draw operating power from the bus/hub. But it is an indicator of communications robustness.)

af_newbie

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Has anyone tried these:

http://www.monoprice.com/products/product.asp?c_id=103&cp_id=10307&cs_id=1030702&p_id=6436&seq=1&format=2

Should be good for 8-10 erupters. Power supply delivers 4A@5V

Any better hubs out there?

oaxaca

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Quote from: arklan on May 26, 2013, 12:15:46 PM

also - guys with 10 or more: it's been brought to my attention that one such order got priority shipping, not express. i'm thinking that, despite my instructions, the office depot worker screwed up. if you guys could check to see if this is the case for you and let me know, i'd appreciate it. i'll figure out some sort of compensation if it's the case. probably a btc refund.

Mine is showing up as Priority as well. Delivery is supposed to be Tuesday, so I don't need a refund. Keep up the good work.

By the way, EBay removed one (1) of my listings because I had a link to the USB driver Friedcat posted.

Bastards!

turtle83

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Supersonic

For those planing on using a raspi make sure to consult http://elinux.org/RPi_VerifiedPeripherals#Powered_USB_Hubs before buying a hub.

For my ztexes i bought a belkin hub (exact model not on list) assuming it would work since other belkins are good. turned out i was wrong. Raspi would see the belkins but not the ztexes attached to it. After an hour of fiddling got it to detect the boards by forcing raspi to usb 1.1 only.

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