Re: GROUP BUY of BITFURY chips + NanoFury NF1 2GH/s USB stick PRODUCT ASSEMBLY in US
Technical details
* No external power supply is required as the board is USB2.0-powered. If you want to run multiple units via a powered external USB hub youll need to get that separately. Powered USB hub is not included in this GB.
* For the same reason the hashing rate will be limited to about 2GH/s. (This is because the device can draw no more than 500mA from a standard USB 2.0 port). At this point we estimate that we should be able to achieve roughly 2GH with those power constraints, even though the chips have demonstrated up to 3.2GH/s. It is also possible that due to those limitations we may have to run the chips at a slightly slower hashing speeds (most likely not below 1.7-1.8GH/s), which on the good side will be controlled via software (cgminer) and depending on your specific USB hub you might be able to squeeze out a few more hashes.
* Overclocking: the board does permit some overclocking (with hardware modifications - see also pencil mod). Be aware though that if this exceeds the limits of your USB port your computer may just turn off the port completely. Also, with increase of speed you will get more heat. The chip and board is designed to use the back side as a heatsink, but if thats not enough you may have to add an additional heatsink. For example - an external powered USB hub or a USB3.0 port may provide significantly more power, so if you want to you could experiment with higher core voltage (currently 0.81V).
* Final product will be a fully assembled and working board. There will be no (plastic) housing or heatsink as those just increase the price. At the announced hashing rate the board should not need any additional heatsink or cooling. Even though there are no harmful voltages on the board it is highly recommended that you avoid touching any of the components while running (mostly as you may disrupt the USB communication).
* Electric shock warning: If your computer is not properly grounded touching the board (or for that matter any metal part of the computer) while your computer is plugged in the wall outlet may result in an electric shock!
Please be safe - plug the device(s) in this order: first turn off and unplug your computer from the wall outlet, then connect all devices and then plug the computer back in the wall.
For unplugging the devices follow the same order - shut the computer down, unplug from the wall, unplug any devices and then plug the computer back into the outlet.
Even though modern power supplies provide proper insulation and the above scenario is unlikely nothing can guarantee that a power supply wont suddenly go bad. So - PLEASE PLEASE PLEASE BE CAREFUL!
* This evaluation unit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered to be a finished end-product fit for general consumer use. Persons handling the product must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation unit does not fall within the scope of the international or transnational directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
More images and albums:
The version 1 board: http://imgur.com/a/eCsVe
Version 2: http://imgur.com/a/OJy63
Version 5: http://imgur.com/a/rVI7o
Version 6: http://imgur.com/a/c4VgM (which is the final one)
Acknowledgments and other information:
* This project was inspired to a great extent by BKKCoin's Klondike K1 Nano Open Source Board and we're grateful for all his work and we'll continue to support his project down the road as we can!
* We've reused the same physical dimensions (including heatsink holes size and position) with the goal that if necessary we may share the same plastic hosing and/or heatsink. We are also planning to release this project as Open Source as well.
* No external power supply is required as the board is USB2.0-powered. If you want to run multiple units via a powered external USB hub youll need to get that separately. Powered USB hub is not included in this GB.
* For the same reason the hashing rate will be limited to about 2GH/s. (This is because the device can draw no more than 500mA from a standard USB 2.0 port). At this point we estimate that we should be able to achieve roughly 2GH with those power constraints, even though the chips have demonstrated up to 3.2GH/s. It is also possible that due to those limitations we may have to run the chips at a slightly slower hashing speeds (most likely not below 1.7-1.8GH/s), which on the good side will be controlled via software (cgminer) and depending on your specific USB hub you might be able to squeeze out a few more hashes.
* Overclocking: the board does permit some overclocking (with hardware modifications - see also pencil mod). Be aware though that if this exceeds the limits of your USB port your computer may just turn off the port completely. Also, with increase of speed you will get more heat. The chip and board is designed to use the back side as a heatsink, but if thats not enough you may have to add an additional heatsink. For example - an external powered USB hub or a USB3.0 port may provide significantly more power, so if you want to you could experiment with higher core voltage (currently 0.81V).
* Final product will be a fully assembled and working board. There will be no (plastic) housing or heatsink as those just increase the price. At the announced hashing rate the board should not need any additional heatsink or cooling. Even though there are no harmful voltages on the board it is highly recommended that you avoid touching any of the components while running (mostly as you may disrupt the USB communication).
* Electric shock warning: If your computer is not properly grounded touching the board (or for that matter any metal part of the computer) while your computer is plugged in the wall outlet may result in an electric shock!
Please be safe - plug the device(s) in this order: first turn off and unplug your computer from the wall outlet, then connect all devices and then plug the computer back in the wall.
For unplugging the devices follow the same order - shut the computer down, unplug from the wall, unplug any devices and then plug the computer back into the outlet.
Even though modern power supplies provide proper insulation and the above scenario is unlikely nothing can guarantee that a power supply wont suddenly go bad. So - PLEASE PLEASE PLEASE BE CAREFUL!
* This evaluation unit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered to be a finished end-product fit for general consumer use. Persons handling the product must have electronics training and observe good engineering practice standards. As such, the goods being provided are not intended to be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including product safety and environmental measures typically found in end products that incorporate such semiconductor components or circuit boards. This evaluation unit does not fall within the scope of the international or transnational directives regarding electromagnetic compatibility, restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore may not meet the technical requirements of these directives or other related directives.
More images and albums:
The version 1 board: http://imgur.com/a/eCsVe
Version 2: http://imgur.com/a/OJy63
Version 5: http://imgur.com/a/rVI7o
Version 6: http://imgur.com/a/c4VgM (which is the final one)
Acknowledgments and other information:
* This project was inspired to a great extent by BKKCoin's Klondike K1 Nano Open Source Board and we're grateful for all his work and we'll continue to support his project down the road as we can!
* We've reused the same physical dimensions (including heatsink holes size and position) with the goal that if necessary we may share the same plastic hosing and/or heatsink. We are also planning to release this project as Open Source as well.