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Thermal Images of the Voltage Modified Gridseed G-Blade Scrypt ASIC

25, Apr 2014

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On the thermal image above you can see how things look on one of the PCBs of the new Gridseed G-Blade Scrypt ASIC in terms of temperature, the GC3355 chips of the device run pretty cool at about 40-50 degrees Celsius. These are the thermal images of the voltmodded Gridseed G-Blade ASIC that we have posted about. Do note that the thermal images are of the modified device with the additional cooling heat sinks attached to it, so the temperature of the voltage regulators is lower and the overall PCB temperature as well. You can use these if you plan on doing a voltage modification to your miners in order to see what are the possibly weaker spots – the components that get hot, in order to improve their cooling and to make sure that you will not overheat and burn your ASIC miner. We do recommend extreme caution when voltmodding the G-Blades as they are already pushed pretty close to their maximum by Gridseed and you do not have a lot of headroom for further gaining some extra performance. The power part of the Blade Miners is clearly not designed to handle much increase in the voltage, even though the GC3355 chips are just asking for more as we’ve seen with the smaller 5-chip ASIC devices from Gridseed.

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Take a look at how hot the PCB gets (around 50 degrees Celsius) near the power connector and that is with about 85W of power consumption per PCB, a clear sign that the connector used is not the perfect choice for powering the G-Blades and while with the stock setup it might be Ok, you should be careful when you voltmod. Do note that we already have a large motherboard chipset heat sink attached to that side of the PCB and it does lower the overall temperature as well. It is placed on the back side of the PCB where the voltage regulators are and it helps to reduce their temperature, because the airflow from the cooling fan does pass through it as well and helps to keep it quite cool.

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Looking at the side of the PCB where the voltage regulators are placed, thanks to the heat sink we have placed directly on the three VRMs their temperature is quite Ok, but there are other components that might have some issues with heat. These are the choke on the left of the voltage regulators on the photo and the 16V capacitor below the regulators as they both get to about 70 degrees Celsius in terms of temperature. And while they still do seem to work fine in the long run this may cause some issues, so you might consider replacing the capacitor with a more serious one.

Again we are going to advise you to be very careful should you consider doing a voltage modification to the new Gridseed G-Blade miners as it can be dangerous and you can easily damage your expensive miner. The modification here is not as easy as just replacing one resistor as you need to do cooling improvements as well and you are not able to push things too much to be on the safe side, so the hashrate increase is also not that big as compared to what you are getting without the modification. So you might really want to reconsider if it is worth doing the modification at all, we are probably not going to be modding another G-Blade for a while until we see how the voltage mod will handle on the longer run in its current state.

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

15, Mar 2014

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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.

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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.

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

14, Mar 2014

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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.

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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.

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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.


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