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Thermal Images of the Gridseed 5-chip BTC/LTC Dual Mode ASIC

15, Mar 2014

gridseed-scrypt-only-vs-dual-mode

Today we have decided to compare the Gridseed 5-chip BTC/LTC Dual Mode ASIC devices in terms of thermal characteristics when operating in Scrypt only mining mode (~8W overclocked) and in Scrypt/SHA-256 dual mining mode (~65W overclocked). We wanted to see how good the massive radiator and high-speed cooling fan will be able to handle in the two modes and more specifically in the dual mode as it is apparently designed to cool the device properly with the high power consumption that it has when mining for BTC (SHA-256) and LTC (Scrypt) at the same time. So we put two ASIC devices next to each other, the one on the left is running in Scrypt only mining mode and the one on the right in Dual mode mining for BTC and LTC at the same time.

gridseed-scrypt-only-vs-dual-mode-thermal-image

We left the devices to work for an hour before taking the thermal images in order to see what are the temperatures of the two miners. Note that the top of the devices does not seem very hot and the highest temperature is that of the cooling fan’s motor. You can however see that around the device running in Dual mode the temperature is higher due to the hot air that is being blown. Looking at the bottom part of the device however we can see more serious difference in the operating temperatures of the two devices. The highest temperature of the device mining in Scrypt only mode we measured is 32.1 degrees Celsius, the device in Dual mode on the right however shows very different results – the maximum temperature we have measured was 73.5 degrees Celsius. As expected the highest temperature measured is at the part where the 3 voltage regulators are located and while they are probably rated to work at temperatures of up to 100-120 degrees C they still do get quite hot as they do not have direct contact with the cooling radiator of the device. So if you plan on running the Gridseed 5-chip BTC/LTC ASIC in Dual mode you might want to consider adding additional small radiators for problem free operation in the long run. The maximum temperature of the Dual mode ASIC aside from the voltage regulator’s region was 44 degrees Celsius, so the cooling of the Gridseed GC3355 chips is more than adequate.

What we would recommend however if you are getting Gridseed 5-chip BTC/LTC Dual Mode ASIC devices is to stick to running them in Scrypt only mining mode where their real advantage is – high performance Scrypt mining hashrate with very low power usage… and no potential problems with the cooling either. Next up we are going to desolder the fan of the Gridseed ASIC devices to see how they will be handling passive cooling in Scrypt only mining mode.

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…

What Hashrate We are Getting from the 5-chip Gridseed DualMiner ASIC

2, Mar 2014

gridseed-5-chip-scrypt-asic-performance

Yesterday in our first impressions from the Gridseed 5-chip Scrypt ASIC device we have shared that the modified version of the cpuminer software is not reporting local hashrate. This is a problem as you can hardly know what is your current hashrate, especially when you start overclocking the device to get some extra performance out of it. You need to rely on information reported by the pool about your worker’s current hashrate, but these tend to often report lower or inaccurate results than actual hasrate. This is due to the fact that pools base the reported hashrate on the submitted shares for a given period of time, so result can vary. We can report that the average hasrate we are getting from our 5-chip Gridseed DualMiner ASIC device in terms of Scrypt mining performance to be hovering around 300 KHS with the stock frequency of 600 MHz that the five Gridschip GC3355 chips inside run at.

We could get the chips to run at about 850 MHz, but they were giving out quite a few HW errors, at least visually as the cpuminer software does not report actual number of stale shares or HW errors that the device makes. Seeing a lot of the red error messages means you are probably getting a lot of HW errors and should try reducing the clock frequency with 50 MHz or more. With 800 MHz the device was running more stable with much less HW errors, however this result was achieved with the use of the standard cpuminer software supplied with the device. Apparently this version of cpuminer had a bug and did not disable the BTC core and as a result mining Scrypt only you can get up to about 60W power consumption. By using the newer fixed cpuminer for Gridseed the power usage got down to the 8-9W range and we could overclock the device at 850 MHz with more stable results and very few HW errors. With 850MHz clock we got pools to report hashrate going up to about 400 KHS which is definitely a nice improvement though the newer version of the cpuminer still does not report local hashrate, so it is hard to get more realistic rate for the performance of the device when overclocked.

If you wan to overclock the Gridseed ASIC devices you need to use one fo the preset frequency values as they will not accept just about any frequency that you send to them. The lst of accepted frequencies consists of the following values: 250, 400, 450, 500, 550, 600 (default), 650, 700, 750, 800, 850 and 900 MHz. It is possible that with the version of cpuminer linked above that ensures low power consumption the ASIC devices may be ale to run pretty stable even at 900 MHz, however we still haven’t extensively tested that. Still even when using 850 MHz with about 400 KHS does not sound bad at all as compared to the claimed stock 300 KHS at 600 MHz.


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