( Note that this has seen some massive price drops the past few days, possibly due to the BTC exchange rate falling - one reseller has them for $55 )
anyone selling these in bulk (USA) ? 
Topic: [SUPPORT THREAD] BFx2 Bitfury USB stick miner - page 7. (Read 27398 times)
( Note that this has seen some massive price drops the past few days, possibly due to the BTC exchange rate falling - one reseller has them for $55 )
Thanks ckolivas,
Will it also work with any other currency? How can I confirm before buying?
Will it also work with any other currency? How can I confirm before buying?
sorry for probably stupid question, but would like to be sure:
does it work with stratum+tcp pools?
Virtually every single bitcoin pool of any signficance only use stratum+tcp, and most miners using cgminer use stratum to mine, so that's a definite yes. does it work with stratum+tcp pools?
sorry for probably stupid question, but would like to be sure:
does it work with stratum+tcp pools?
does it work with stratum+tcp pools?
Pencil Trick Over clocking
I kept hearing about a "pencil trick" to over clock other miners and after looking into how that works, it will work on these miners too.
The resistor you need to color is R8. Coloring just a *little* bit of pencil across the resistor will increase the core voltage a few 10's of mV, which is needed to over clock the miners.
Again, if you do this I would recommend a fan!
-a[g
I kept hearing about a "pencil trick" to over clock other miners and after looking into how that works, it will work on these miners too.
The resistor you need to color is R8. Coloring just a *little* bit of pencil across the resistor will increase the core voltage a few 10's of mV, which is needed to over clock the miners.
Again, if you do this I would recommend a fan!
-a[g
Any word yet on the bfgminer support?
I think your instructions are overly complex and I highly recommend people just use the cgminer way.
Con's right. Please follow the install instructions provided by cgminer. I've edited the original post to reflect.Linux cgminer support:
Since support for this miner is in the master cgminer branch, getting a Linux binary is as easy as downloading the latest cgminer--x86_64-built.tar.bz2 file from:
http://ck.kolivas.org/apps/cgminer/
After unpacking the archive file you will probably need to do two things:
#1: Blacklist the ftdi_sio driver: copy the following single line to /etc/modprobe.d/blacklist-ftdi.conf
blacklist ftdi_sio
#2: Fix the permissions on the devices so you can mine without being root: copy the following single line to /etc/udev/rules.d/01-ftdi.rules
SUBSYSTEM=="usb", ATTR{idVendor}=="0403", ATTR{idProduct}=="6014", MODE="0666"
or you can follow the instructions in the ASIC-README file provided by cgminer, which will do both of the above.
After doing #1 and #2, reboot and you should be good to go!
If anyone needs a 32-bit Linux binary that will work on a recent Ubuntu (tested on 13.10), reply to this message and I'll post one.
I think your instructions are overly complex and I highly recommend people just use the cgminer way. There is but one step to setting up on permissions on ubuntu (as per the README):Since support for this miner is in the master cgminer branch, getting a Linux binary is as easy as downloading the latest cgminer-
http://ck.kolivas.org/apps/cgminer/
After unpacking the archive file you will probably need to do two things:
#1: Blacklist the ftdi_sio driver: copy the following single line to /etc/modprobe.d/blacklist-ftdi.conf
blacklist ftdi_sio
#2: Fix the permissions on the devices so you can mine without being root: copy the following single line to /etc/udev/rules.d/01-ftdi.rules
SUBSYSTEM=="usb", ATTR{idVendor}=="0403", ATTR{idProduct}=="6014", MODE="0666"
or you can follow the instructions in the ASIC-README file provided by cgminer, which will do both of the above.
After doing #1 and #2, reboot and you should be good to go!
If anyone needs a 32-bit Linux binary that will work on a recent Ubuntu (tested on 13.10), reply to this message and I'll post one.
Code:
sudo cp 01-cgminer.rules /etc/udev/rules.d/
To do so, find a 40mm fan and screw it to the heat sink. Then solder the wires to the USB connector as indicated above.
Anyways, have fun hacking up my creation!
Oh man that mini fan is so cool!
thanks for all the info
There has been a request to discuss over clocking these boards. I'm the designer of the board, and these are my thoughts on over clocking, but of course your results will vary and you could end up destroying your boards! I don't recommend doing any over clocking, but since Bitcoin is about experimentation, here goes nothing!
These boards were designed to run at 4GH/s with ambient cooling on the heat sink. This allows them to run at <500mA and thus be USB2 compatible. When over clocking a Bitfury based design, heat is your enemy, you will need active cooling from a fan if you over clock these boards.
With the way Bitfury chips are designed, heat really is the enemy. As the chips heat up, they slow down and also start producing hardware errors. Software over clocking will increase the heat dissipated by the chip and thus can actually produce worse results. Same with increasing the core voltage.
Software over clocking:
The current cgminer release supports software over clocking with the --bxm-bits=XX command line parameter. Non-over clocked optimal is 53 or 54. However, you can go to 55 or 56 if you introduce active cooling.
Increasing the core voltage:
In order to get the Bitfury chips to run stably at higher clock values increasing the core voltage is necessary. Again, the boards were designed to get to 4GH/s so the core voltage was chosen accordingly. Increasing the core voltage will really increase the heat output. Cooling the boards with a fan is absolutely necessary.
The core voltage is set by three resistors, but the only one you want to change is R6. It is right in the middle of this picture:
As built R6 = 499 ohm, to increase the core voltage use a larger value, but don't go above about 1.5k. You'll need a 0805 surface mount resistor. To measure the core voltage the chips are seeing, measure across the decoupling capacitors that surround the Bitfury chips. Explaining how to desolder/solder a resistor is way beyond the scope of the forum ;-)
Active cooling
I thought it might be fun to add a 40mm fan to the heatsink:
To do so, find a 40mm fan and screw it to the heat sink. Then solder the wires to the USB connector as indicated above.
Anyways, have fun hacking up my creation!
These boards were designed to run at 4GH/s with ambient cooling on the heat sink. This allows them to run at <500mA and thus be USB2 compatible. When over clocking a Bitfury based design, heat is your enemy, you will need active cooling from a fan if you over clock these boards.
With the way Bitfury chips are designed, heat really is the enemy. As the chips heat up, they slow down and also start producing hardware errors. Software over clocking will increase the heat dissipated by the chip and thus can actually produce worse results. Same with increasing the core voltage.
Software over clocking:
The current cgminer release supports software over clocking with the --bxm-bits=XX command line parameter. Non-over clocked optimal is 53 or 54. However, you can go to 55 or 56 if you introduce active cooling.
Increasing the core voltage:
In order to get the Bitfury chips to run stably at higher clock values increasing the core voltage is necessary. Again, the boards were designed to get to 4GH/s so the core voltage was chosen accordingly. Increasing the core voltage will really increase the heat output. Cooling the boards with a fan is absolutely necessary.
The core voltage is set by three resistors, but the only one you want to change is R6. It is right in the middle of this picture:
As built R6 = 499 ohm, to increase the core voltage use a larger value, but don't go above about 1.5k. You'll need a 0805 surface mount resistor. To measure the core voltage the chips are seeing, measure across the decoupling capacitors that surround the Bitfury chips. Explaining how to desolder/solder a resistor is way beyond the scope of the forum ;-)
Active cooling
I thought it might be fun to add a 40mm fan to the heatsink:
To do so, find a 40mm fan and screw it to the heat sink. Then solder the wires to the USB connector as indicated above.
Anyways, have fun hacking up my creation!
Looks like there's a U.S. reseller selling them for exactly that amount ($95): http://www.eyeboot.com/Bitcoin-Miners-btc-mining?product_id=59
That is my site, we are the Asian reseller
In stock today and we are shipping immediately.
Hiya mate,
you might want to add the Amperage ratings to the USB hubs on your website, I know that the dipo one is 20A which makes it a "monster" for USB mining. Each port delivers 5.26VA which should easily support
cheers,
kev
Looks like there's a U.S. reseller selling them for exactly that amount ($95): http://www.eyeboot.com/Bitcoin-Miners-btc-mining?product_id=59
That is my site, we are the Asian reseller
In stock today and we are shipping immediately.
Looks like there's a U.S. Asian reseller selling them for exactly that amount ($95): http://www.eyeboot.com/Bitcoin-Miners-btc-mining?product_id=59
Edit: U.S., Asian, European, Atlantian.. global village, right?
Edit: U.S., Asian, European, Atlantian.. global village, right?
THey can be overclocked to 5 giga hash,
at 0.165 bitcoins they are priced at $95, which is a fair price
at 0.165 bitcoins they are priced at $95, which is a fair price
Can you tweak these to get them up to 5 gh/s?
Is there a guide for over clocking them yet?
Is there a guide for over clocking them yet?
i am just curious why would somone buy this at 0.17
when you could buy a 2gh antminer for 0.037 and even 2 for a total of 4gh or 4.4 overclocked for 0.74 which is half the price
when you could buy a 2gh antminer for 0.037 and even 2 for a total of 4gh or 4.4 overclocked for 0.74 which is half the price
Since people will ask what hashrates these get, I've been running mine at bxm bits 54, but they are engineering samples and not final units. Nonetheless this is what I have:
Code:
1: BXM 0: | 3.747G/3.743Gh/s | A: 205605 R: 0 HW: 0 WU: 52.3/m
2: BXM 1: | 3.781G/3.772Gh/s | A: 234938 R: 0 HW: 0 WU: 52.8/m
Example cgminer command line:
./cgminer -o stratum+tcp:// -u -p --bxm-bits=XX
Where XX is in the range of 50-55. I recommend some experimentation to find the best setting for your particular miners.
./cgminer -o stratum+tcp://
Where XX is in the range of 50-55. I recommend some experimentation to find the best setting for your particular miners.
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