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First Impressions from the iPollo V1 Mini Ethash/ETChash ASIC Miner

15, Nov 2022

We got a hold of a nice little golden iPollo V1 Mini Ethash/ETChash ASIC miner and decided to play around with it to see why so many people like these small home-oriented high-hashrate and low-power ASIC miners with support for the Ethash and ETChash algorithms. You might be able to score a good deal on used iPollo V1 Mini now that these devices are not that profitable like they were during the time when you could mine Ethereum (ETH) with them and they can still come in handy in the next bull run or meanwhile if you mine some Ethash or ETChash coins meanwhile. The nicest thing is that they are very compact, not that noisy in general and very power efficient compared to what a GPU mining rig would use to give you the same hashpower. And they do come with WiFi adapter built-in, so once you set them up they are easy to move around the house or apartment as you would only need to plug them in a power socket in order for them to start hashing, no need to use network cables, although you can still if you want to.

Now, let us start with a little clarification as iPollo does offer two sets of V1 ASIC miners, one is described as ETC Miners and have the word Classic in their product names. These are iPollo V1 Mini Classic (130 MH/s at 104W) and iPollo V1 Mini Classic Plus (280 MH/s at 270W) with both devices having a design memory of 3.75 GB out of which the available memory for use is 3.6 GB. This means that these devices can mine Ethash or ETChash coins that have up to a 3.6 GB DAG size. There is also the iPollo V1 Classic (1550 MH/s at 1240W) with the same memory limitation available, but that one is big and noisy and not very suitable for home mining anyway.

The other ETH Miner category is similar in terms of hashrate and power usage or more efficient, but these devices do come with more memory available. The design memory is 6.0 GB of which the available memory for DAGs is 5.8 GB, meaning that you can mine even Ethereum (ETH) forks such as ETHF or ETHW that have DAG size of over 5GB already. Ethereum of course is no longer available for mining since it has switched from PoW to PoS. But if you get the iPollo V1 Mini (300 MH/s at 240W), the model we are looking at and testing here, or the more efficient iPollo V1 Mini SE Plus (400 MH/s at 232W) or the smaller iPollo V1 Mini SE (200 MH/s at 116W) you should be safer on the longer term on what you would be able to mine many more Ethash or Etchash coins passing the 4GB DAG size in the near future. There is also the iPollo V1 (3600 MH/s at 3100W), but just like the similar Classic counterpart this one is big, noisy and quite expensive for the regular home miners anyway.

As you probably already guessed, after checking that the device works fine, we opened it up. The iPollo V1 Mini ASIC miner is quite compact and comes with an external 12V power supply with a maximum rating of 360W (2 lines rated at 180W each) with two 6-pin PCI-E power connectors coming out of this passive Huntkey PSU. You need to plug in the two 12V power lines into the miner that has a power usage of 240W and that should be fine for the wires and the miner. The 6-pin PCI-E power connectors are normally rated at 75W, but good quality ones are able to handle 100W or more usually. There could be problems however if you try to use a 6-pin PCI-E power connector for a 150W or more as it usually starts to overheat and burns up due to being significantly overloaded.

The power supply is quite good, although it gets hot when mining it is very efficient and provides stable power to the miner. The power usage we have measured with the stock power supply is around 50W for the miner while getting ready to mine and around 244W at the wall when mining begins. Connecting a 1000W Platinum rated Corsair power supply resulted in 249W of power usage while mining (4-5W more due to the extra 5V line power consumption the Corsair has).

Due to the compact size of the miner the manufacturer Nano Labs has decided that they could use two small 60mm size fans with high-rpm to provide the cooling for the miner. And while these fans do their job very well, at maximum RPM they are quite noisy (around 7000 rpm), though with the fan control and normal operation they go down to a sub 5000 rpm and the noise is much more acceptable. With the maximum speed of the two cooling fans you are going to be getting around 64 dBA noise level while with them running normally with the miner operating at around 50 degrees Celsius and the fans at around 4800 rpm the noise level measured is around 52 dBA and that is much more acceptable, though still not very silent. The two fans used are from a Chinese manufacturer called Ebonda and are rated at 0.8A at 12V. We are of course going to try and optimize the cooling and see if this miner can be made more silent, but that will follow in another post.

The cooler of the miner is a large aluminium copper block that seems like a server type heatsink, but does not seem to be a standard sized one… the mounting hole distance, the protruding copper block and not centred placement of the screws make it seem like a custom design. Would’ve been nice if you could just mount a good tower-based CPU cooler to make cooling easier and less noisy, but that would not be an easy task – certainly not as easy as juts replacing the heatsink and fans. The miner itself consists of two boards with a pin header connection between them. The bottom one is the control and power board and the top one is the hashing board with a single large ASIC chip. BTW after disassembling the miner with replaced thermal compound using Arctic MX4 thermal grease we’ve seen about 1 degree Celsius drop in the operating temperature of the miner.

The Nano Labs V66H ASIC single chip is apparently capable of 300 MH/s Ethash/ETChash hashrate with a power usage of around 200-ish Watts of power usage, no exact specs of the chips. These are easy to scale with big hashrate miners if you just increase the chip count. Though apparently efficiency could be further improved judging by the specs of the Mini SE and Mini SE Plus miners that provide even better power efficiency. Nano Labs’s iPollo Ethash/ETChash ASIC chips might not be the most power efficient in the bunch, but they do seem to perform quite competitively and the 6GB of memory is a plus as well. Not to mention that these miners do come with support for dual-mining with ZIL, so a little extra profit added by that as well, a profit that may allow the devices to successfully compete with higher hashrate products with lower power usage such as Jasminer X4.

The iPollo V1 Mini ASIC miner comes with a simple and easy to use web-based interface for monitoring and control of the device, there is also the iPolloTool software for Windows that allows for easier setting up and monitoring of multiple miners at once. The average reported hashrate we are seeing for the iPollo V1 Mini is around 300 MH/s with an operating temperature at around 50 degrees and fans at around 4800 rpm. At 244 Watts of power used and with 52 dBA noise. So, the claimed specifications are pretty much what you should expect to get in real usage.

The miner supports both ETChash and Ethash mining and dual-mining with ZIL as well. There is however a catch with the dual mining support, the latest dual-mining firmware is not yet available on the official firmware upgrade package yet, but you can download firmware version 0.76.96 from RabidMining. There does not seem to be support for Nicehash mining on the iPollo out of the box, although NiceHash just posted how to enable support for mining with iPollo. The 6GB memory onboard allows for a decent future-proof capability of the device (be careful with the 4GB models!). It takes about 4 minutes for the miner to get ready to mine ETC once you boot it up, so quite quick on that front compared to Jasminer X4 where you will need to wait about 20 minutes.

There is a user fan control option available with both manual and automatic modes available for the user to configure. And there is also a Wireless network setup in the web-interface that you need to use to connect your device to a WiFi network. The first time you run it needs to be connected with a network cable so that you can setup the Wifi, after that it will just connect to the wireless network you set it up to use automatically. There is unfortunately no control for operating frequency or voltage available, so no user options available for trying to optimize the device for better power efficiency or faster hashrate for example. The available logs in the web interface are not very usable as although there are three different logs available for you to monitor through the web interface neither one of them is the cgminer output for the actual mining process (the device uses a modified cgminer as mining software).

So, all in all, the iPollo V1 Mini Ethash/ETChash ASIC miner is a nice compact home miner for anyone interested, it works well, pretty versatile and performs as expected… there is of course more functionality to be desired, so room for further improvement. If you are looking to get one of these look for some sub $1000 USD deals.

– For more about the iPollo V1 Series of Ethash/ETChash ASIC miners…

Additional Improvement for a Silent Modified Jasminer X4 1U ASIC Miner

10, Nov 2022

It seems that we kind of missed something important in the silent modification of the Jasminer X4 1U miners described here and that is to take into account the one other thing that generates heat inside the miner. That is the controller chip on the miner’s control board that normally does not come with a cooling heatsink on top of it. The Xilinx Zynq-7000 SoC (XA7Z020) used is not a traditional FPGA like we kind of assumed without properly checking the specs of the chip. It is in fact a dual-core ARM Cortex-A9 Application Processor Unit (APU), and as you know having a processor, even a lower power ARM one can get things hot when operating and under load 24/7…

So, what apparently happened during the night, with no one present around the miner is the control board of the Jasminer X4 1U that we were using for testing just dying on us for no apparent reason. The only thing that comes to mind is the chip overheating for some reason and dying on us, although the normal operating temperature does not seem to suggest any overheating issues. Normally, when the miner is in its original package inside the 1U box with all the high-rpm server fans the inside ambient temperature is probably lower and thus no additional cooling has been provided for the controller board’s processor, but when you open it up and modify it to use silent fans things might become different. Thankfully we’ve had a spare controller board already ordered just in case something like that happened, so we replaced it immediately and the miner continued to function like before.

We’ve measure the operating temperature of the Zynq APU on the new controller board and it is nowhere near dangerous levels for such chips, at around 52 degrees Celsius (125.6 F) it should be pretty much safe even without extra cooling, right. Well, it might be now, but if what for some reason this temp rises for a while, probably that is what happened for some reason with the APU getting higher load for a longer period of time resulting in overheating (thouhg it could also be some totally unreleated reason as well, can’t be sure). Just to be on the safe side, it is a good idea to add a small memory chip cooler on top of the Zynq APU in order to keep the operating temperature lower at all times. Especially if you plan on using a silent modified miner and the the standard configuration where the issue could be less prone to appear.

Also, a good advice might be to order a spare controller board just in case, especially if you are running more than just a single Jasminer X4 1U ASIC miner. This is to avoid possible downtime in case something happens with the controller board on your miner. Do note that you can connect multiple hashing boards with Jasminer X4 ASICs to a single control board (our both had 3 connectors for hash board), though we’ve seen board with more connectors as well. We’ve tried and the control board detects and functions with a hashing board connected to all of the three available ports. So, as a temporary solution you might use a single control board to drive multiple hashboards of multiple miners in case you have more than juts one and you get a dead controller board.

Trying to Further Optimize the Jasminer X4 1U ASIC Miner

5, Nov 2022

We’ve been playing around with a Jasminer X4 1U Ethash and ETChash ASIC miner for a couple of days now and we have some more things to share with you if you are interested in the device. We’ve already covered some interesting findings and possible tweaks for the Jasminer X4 1U ASIC miner here, but we continued further trying to optimize the miner and see if we can squeeze a bit of extra performance from it. Our next obvious step was to disassemble the hashing board with the ASIC chips…

Removing the aluminium cooling heatsink, a single piece for the whole board, revealed the eight Jasminer X4 ASIC chips on the hashing board along with a controller chip and two memory modules. And a ton of thermal grease that needs to be cleaned and replaced before assembling the whole thing back again. Only the controller chip is not covered with thermal grease, instead it uses a thicker thermal pad for contact with the heatsink. All of the chips did have a good contact with the heatsink, so supposedly no expected issues with thermal transfer and cooling here. So, our hopes of getting a bit of thermal improvement by replacing the thermal compound with a better one would probably end in vain, but since we still have to replace the thermal interfacing material we’ll do it.

Cleaning up the whole thing properly does require some time and effort as due to the size of the crystals on the Jasminer X4 ASIC chips it is like cleaning 8 CPUs of computers. And you need to make sure you are careful not damaging anything, though the cleaned-up board and chips do like quite good. We are reusing the original thermal pad for the controller chip as we do not believe it is necessary to replace that one with a more efficient one anyway.

The main controller chip on the hashing board is a Trion T120 FPGA along with two DDR3 memory modules right next to it (no, that is not how 5GB of memory looks like!). This is the controller chip for the Jasminer X4 ASIC chips that is being used on the hashing boards, the miner does have a second FPGA controller chip with separate RAM chips on the main control board that hosts the software and web interface of the miner, there however we find a Xilinx Zynq chip.

Here is a single of the eight Jasminer X4 ASIC chips in a 45×45 mm package (678 square millimetres die size) with 1TB memory bandwidth, 5GB of memory and a hashrate per chip of 65 MH/s with each of the chips having 384 computing cores and 384 on-chip dies according to the manufacturer with a 512-bit bus width, an operating frequency of 800 to 1 GHz and a power consumption of 23 Watts.

We’ve used the Arctic Cooling MX4 thermal compound to cover the chips before reassembling the hashing board with the aluminium heatsink. It is a decently priced high-performance product that we like to use along with Noctua’s NT-H1 due to their great price/performance ratio, and there does not seem to be much point to try and use more expensive solution anyway. When applying other thermal compound make sure to put a little more on the memory chips as there the gap with the heatsink is a bit more compared to the one of the ASIC chips.

We’ve compared the hashrate and operating temperature of the Jasminer X4 1U ASIC miner before changing the thermal compound and after doing so, leaving the device to hash for more than 10 hours in order to get a good average of the operating temp and hashrate. Do note that this is our already silent modified unit with replaced fans and firmware, so your device might report a temperature range and not a single number. The before and after results are very similar, pretty much the same average hashrate and just 1 degree Celsius difference, so there is really no need to play around with the thermal grease as it will not give you much of an improvement. We also did a power usage measurement before and after at the wall, the results there were not much different as well – 266.1 W before and 265.7 W after the thermal grease replacement.

The next thing we wanted to try out here was to use a different power supply than the one the Jasminer X4 1U comes equipped with. There are three obvious reasons to replace the PSU – to see if the 300W of the stock one might be a limiting factor, to use a silent power supply and to possibly get a lower power consumption. We’ve connected a 1000W Corsair HX1000i power supply (Platinum efficiency rating) to the ASIC miner in place of the stock PSU and unfortunately the results were not really that encouraging. You get a silent power supply as the HX1000i runs passively at sub 300W of power usage, but the power consumption measured at the wall was 263.7 W or just 2 Watts less compared to the stock PSU.

The other thing we wanted to check with the more powerful power supply was if the Jasminer X4 1U would be able to run at 250 MHz operating frequency with the new thermal interface material in place and more than enough power. Unfortunately, our miner continued to dislike the 250 MHz operating frequency returning a lot of errors trying to hash and thus effectively operating at a fraction of the actual performance you get at 225 MHz where everything runs stable and without errors. So, the fact that at 250 MHz the mining device uses almost 300 Watts of power measured at the wall does not mean that the stock PSU is not able to handle that. And we do not think that the cooling of the ASIC chips is also an issue here for them not be able to run properly at 250 MHz.

Jasminer X4 does come with a very good thermal grease already applied, so no need to replace it. The stock 300W PSU is also really good in terms of efficiency and is not limiting you running the miner at higher clocks. The only thing is that the stock power supply is quite noisy and you might want to modify or replace it if you are making your miner into a silent one like we did with ours. It seems that Sunlune already did very well with the hardware side of their Jasminer X4 ASIC miners, both in terms of efficiency and performance. What they could work a bit more on however is the software side as their devices do not currently support dual-mining ETH/ETC-based coins along with ZIL, something that could easily bring the miners an extra 30-40% profit. The lack of this feature means that a competitor with dual-mining support already available can easily provide the same profitability with a cheaper device that has lower hashrate and/or is not as power efficient as the Jasminer X4.


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