[ANN] Twinfury USB miner

[Atomar]

OK. So after 40 Minutes the stats are:

TBF 0 28.2°C 5375.106 Mh/s
TBF 1 32.4°C 5581.668 Mh/s

You probably can tell which Twin has the 6.8k resistor
Think, I have to do the second one also with an 6.8k ....

Good Job aauer1 !!! Looking forwar to do the Software modd!

[eneloop]

always post hw error rate too please (after several hours hashing).

[aauer1]

OK. So after 40 Minutes the stats are:

TBF 0 28.2°C 5375.106 Mh/s
TBF 1 32.4°C 5581.668 Mh/s

You probably can tell which Twin has the 6.8k resistor
Think, I have to do the second one also with an 6.8k ....

Good Job aauer1 !!! Looking forwar to do the Software modd!

That looks really good. TBF 1 is the one with the 6.8k resistor .

Thanks for testing! Will post a small tuning howto on the http://minecoin.net website.

[aauer1]

For all of you, who are interested in tuning the Twinfury, I posted one method on the minecoin.net website. This is the kind of tuning atomar has successfully tested.

[Atomar]

OK. Here we go with the stats:

Uptime: 15 Hr



Big question now: What's better; more Mh/s OR less error
On one of the Twin's I have to change the resistor....

[eneloop]

0: 5371*0.944= 5070 MH/s
1: 5567*0.9= 5010 MH/s
-> Both are working at about the same speed.

[Atomar]

Sorry. Don't get it. What are you calculating ??

And the question is still: What's better; more Mh/s OR less error ??

[eneloop]

just percentages.

10% error rate means 10% of your nominal speed are erros -> nominal speed*0.9 is your real hashing speed.
5.4% error rate means nominal speed*0.944

whats better -> all depends on nominal speed to error rate
due to power consumption lower speed + lower error rate is better than higher speed + higher error rate.

in your case both are allmost the same, twinfury 0 is the slightly better one.

[Atomar]

Cool !! Thank's for the Explanation !

That's what I thought. I probably replace the 6.8k resistor with 8.2k one.

[MassimoJee]

Are Twin Bitfury USB miners still in stock ? If not, when the next batch ?

[Atomar]

Right now there are 30 in stock !!

http://minecoin.net/product/twin-bitfury-usb-miner/

[Blackwolve]

next time i will take express, send last monday and runs upto 10 days

I'm happy to see, that the overclocking works fine. Can you touch the heatsink and did you have a fan to them?

[Atomar]

I do have a arctic breeze pro fan running on about 50% speed. The temperature right now is 27°C & 32°C.
So it stays pretty cool WITH the fan.

For the RaPi: That is 43°C with 0.11 CPU load the last 15 min.

[aauer1]

About 70 Twinfury miner are still available from the first batch but only 30 pieces of them are tested and working at the specified hash rate.

I have some other interesting news for you:

• First of all. Thanks to luke-jr for merging my voltage scaling patch into the Twinfury driver of bfgminer. This means that I will post a firmware update the next days with some instructions to do the update. So, you can use the voltage scaling feature of bfgminer with your Twinfury.
• The other news is that I got a prototype of my 7 port USB hub which is the perfect accessory for the Twinfury miner. The port spacing is wide enough for the big heatsink of the Twinfurys. So, no port gets unused. Have a look at the pictures below. Furthermore, the hub is working with the Raspberry Pi.

[Blackwolve]

The hub looks well.
Does it use USB2 with much more power or support it USB3?

Price and delivery time plz

I have to buy a new hub, so i can buy it from you and report.

[cryptobal]

I have some other interesting news for you:
The other news is that I got a prototype of my 7 port USB hub which is the perfect accessory for the Twinfury miner. The port spacing is wide enough for the big heatsink of the Twinfurys. So, no port gets unused. Have a look at the pictures below. Furthermore, the hub is working with the Raspberry Pi.

can the hub handle 7 overclocked twinfurys? (>6,3Amps) ??

[takagari]

Mine's already up on ebay, see what I get

[Atomar]

Link ?? ;-)

[aauer1]

The hub looks well.
Does it use USB2 with much more power or support it USB3?

Price and delivery time plz

I have to buy a new hub, so i can buy it from you and report.

It is just an USB 2.0 compatible hub (only supports low speed and full speed USB transfers). I have just got 5 prototypes working without a case or something like that. I will probably produce some of it the next year.

At the moment, I'm not able to tell you the exact price of the hub. But foremost the USB connectors are a bit pricey. I have to see if my fab is able to get the price down.

can the hub handle 7 overclocked twinfurys? (>6,3Amps) ??

Yes the hub can handle this. The power supply is able to deliver around 8Amps for the 7 ports (can also be improved to 10Amps for 7 ports).

[Pseyco]

I just ordered one device yesterday, hope that i get it delivered soon, i will post a feedback here, if the delivery is okey, and how the stick will work.

Hope to get it fast =)

Best regards
Pseyco