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Power Usage and Thermal Images of the 1-chip Gridseed DualMiner USB ASICs

14, Mar 2014

gridseed-dualminer-usb-thermal-1

You can read our first impressions from the DualMiner USB Scrypt ASIC here and now we took some time to take some thermal images of the miner to check the temperature adn what actually gets hot, so you can consider some extra cooling as well as to measure the actual power usage of these small USB-powered devices based on a single Gridchip GC355 processors for mining BTC/LTC. It seems that the DualMiner’s aluminum heatsink on one of the sides of the device is working quite well, the temperature it shows is quite even and goes to just aa bit short of 50 degrees Celsius. That is with the miner running for Scrypt only mining mode at 850 MHz with 70 KHS hashrate, we are not very mich interested in the combined mining mode where the device also mines for SHA-256 cryptos, note though that if you use the miner in dual mining mode it will get hotter.

gridseed-dualminer-usb-thermal-2

The other side fo the device’s PCB is with the chips and the two things that get hotter as expected are the GC3355 processor as well as the controller chip, so you might want to add some small cooling radiators on them in order to get better cooling. Alternatively adding a small fan like a USB one to create a good airflow or combining both things will make sure that the miner will run for longer period of time at its maximum without giving you trouble. Again this thermal images shows the miner running in Scrypt only mining mode with temperature of the chips going as high as close to 53 degrees Celsius. If you run in Dual Mode however the extra 1W of power consumption that is expected from the BTC side might increase the operating temperatures with another 10-12 degrees on top of what we are getting with Scrypt only mode.

gridseed-dualminer-usb-power-usage

What about the power usage? Since these devices are designed to be powered by a USB port their maximum power usage should be no more than 2.5W (0.5A at 5V) and that can be reached in Dual Mining mode. The idle power usage of the device when it is just plugged in and running in Scrypt only mode is a bit high at 0.875W, and it only increases to 1.485W when you start the miner. So getting about 70 KHS of Scrypt mining hashrate for just about 1.5W of power consumption is a great result for the hashrate you are going to get, what is not so attractive is the price that these devices are still being sold for. Nevertheless we are very satisfied from how the single chip DualMiner SUB ASIC devices are made and work, so next in line for similar testing are the 5-chip Gridseed BTC/LTC ASIC miners.

Download bfgminer 3.10.0 for Windows Scrypt mining on Gridseed 5-chip ASICs

13, Mar 2014

bfgminer-gridseed-support

Another software miner now has support for the 5-chip Gridseed GC3355 BTC/LTC ASIC devices and that is bfgminer, though you should note that there is a separate branch that supports the Gridseed hardware and the official 3.10.0 release is not compatible. The version that you can download below compiled for windows is the one with Gridseed support and you can also use it for Scrypt GPU mining, though the command line we have provided in the BAT file is only going to start bfgminer and look for Gridseed devices (remove the -d gridseed option to use GPUs too). Also note that the command line starts the miners with 850 MHz operating frequency that should result in about 360 KHS scrypt mining hashrate (60 over the stock 300 KHS) – should be stable option for good overclock performance with low to no HW errors, but your results may vary. You can get down to 800 MHz if you are getting more HW errors, or try to get up to 900 MHz if you get no HW errors to see if you can get 380 KHS stable.

This version of bfgminer shoudl work with both the earlier 5-chip Gridseed ASIC devices as well as the newer revisions, it detects and work with our miners using both the newer STM32 Virtual COM port driver as well as the older CP2102 USB to UART Bridge Controller. Note that bfgminer requires the devices to be working with their standard virtual COM ports and not to have the drivers replaced with Zadig with WinUSB like cgminer does. If you have installed the WinUSB drivers you may need to Uninstall the drivers and unplug and plug the ASIC devices so that the default driver is installed again. Alternatively you can try to install the GridSeed.inf driver you will find in the miner archive. Note that the version of bfgminer provided here is only for Scrypt (LTC) mining on the 5-chip Gridseed ASIC devices!

– You can download bfgminer 3.10.0 for Scrypt mining with Gridseed 5-chip ASICs on Windows OS here…

Download cgminer 3.7.2 for Windows Scrypt mining on Gridseed 5-chip GC3355 ASICs

6, Mar 2014

cgminer-3-7-2-gridseed-windows

We now have a version of cgminer 3.7.2 available for mining Scrypt (LTC) only on the 5-chip Gridseed GC3355 ASIC devices with properly displayed local hashrate as well as HW error rate and the full cgminer 3.7.2 functionality (thanks to a user called dtbartle on GitHub). We have compiled a windows version of that miner that you can download and install it to finally have fully functional cgminer on your Gridseed Scrypt ASIC (source code available here). Have in mind that you need to install a WinUSB driver on top of the standard installed USB to COM driver for the miner in order for cgminer to detect and run on your ASIC in LTC only mode with low power consumption of about 8W.

zadig-gridseed-dualminer-usb-config

– Download and run the latest version of Zadig
– From the Zadig interface select Options and choose List All Devices
– From the Dropdown list of devices select CP2102 USB to UART Bridge Controller and click on Replace Driver with the WinUSB driver selected
– If you have multiple 5-chip GC3355 DualMiner USB devices connected you may need to repeat the procedure for all of them
– Download, edit and run LTC_ONLY.bat file from the modified cgminer 3.7.2 for Gridseed ASICs to start mining for LTC

It seems that there are some ASIC devices that may be using different virtual USB to COM drivers other than the CP2102 that our unit has (for example ST32 Virtual COM Port), unfortunately we don’t have any of those to test with. You can however try to make things work by replacing the other driver with WinUSB, just select the right name from the dropdown box (do not try to rename drivers, it is pointless) and Replace it with WinUSB (you may need to unplug and plug the USB cable to the miner after that). If after installing the WinUSB driver over the virtual USB to COM driver the ASIC does not work with cgminer, you just need to uninstall the driver from the Device Manager and unplug/plug the USB cable to the device for it to install the original USB to COM driver and it should be functioning again with cpuminer (note that this way you may have it running on a new COM port).

Do note that if running single Gridseed ASIC device you can have it connected to the system and use the hotplug 0 option, if you have more than a single miner you may have to set commandline option hotplug to 5 or 10 and then run cgminer and start plugging the USB cables of the miners (USB hubs with power on/off buttons work great for that).

– You can download cgminer 3.7.2 for Scrypt mining on Gridseed 5-chip GC3355 ASICs on Windows OS here…


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