Posts Tagged ‘Bitmain AntMiner

Something interesting and not so nice regarding Bitmain and their latest batch of Antminer S9 ASIC miners, it seems that although the company is listing prices in USD, BTC, BCC and LTC on their website it will only accept payment in BCC (Bitcoin Cash) for the batch of miners shipping November 21-30. As a maker and seller of these devices Bitmain of course has the right to sell them any way they want and accept the payment in the form they choose, but this way of essentially “forcing miners” to buy BCC to pay for the hardware (in case they do not have it) is probably not very “politically correct”. It is understandable that they want to support BCC, but is this the right way to do it or it will fire back with users going to alternative options for ASIC miners (not that there are many available unfortunately)…

The questionable text about BCC payment for the batch is under Payment and is quoted below:

Only BCC payment method is accepted in this batch, please use the exact amount mentioned in your order and complete the payment within one hour. After one hour, the order will expire and your payment may not be detected by the system automatically. If the payment is submitted but the receipt is delayed, we will make your payment “Valid” manually.

Bitmain has announced a new AntMiner T9 ASIC miner that should go on sale today for $1104 USD offering 11.5 THS hashrate. The new miner is based on the previous AntMiner S9, though it comes with a bit less chips that are apparently clocked at a higher operating frequency. The new T9 is a bit cheaper, but not as efficient as the S9 as based on the official specs it consumes about 1450W for the 11.5 THS while the Batch 22 of the S9 came with 11 THS at 1078W and Batch 23 was with 14 THS for 1372W. The new T9 miner comes with just 171 BM1387 chips while the S9 was based on 189 BM1387 chips. The two fans cooling the new device are the same as on S9, so you can expect similar level of noise from the device. So in short the new AntMiner T9 does not in fact seem so attractive to miners, but with the lack of new S9 miners you might not have much of a choice…

BitMain AntMiner T9 Specifications:
– Hash Rate: 11.5TH/s. A variation of +/- 5% is expected
– Power Consumption: 1450W +7% (at the wall, with Bitmain’s APW3 PSU, 93% efficiency, 25°C ambient temperature)
– Power Efficiency: 0.126J/GH + 7% (at the wall, with Bitmain’s APW3 PSU, 93% efficiency, 25°C ambient temperature)
– Rated Voltage: 11.60 ~ 13.00V
– Chip Type: BM1387
– Chip quantity per unit: 171 chips
– Dimensions: 350mm (l) x 135mm (w) x 158mm (h)
– Cooling: Two 12038 fans. Front fan: 6000RPM, rear fan: 4300RPM
– Operating temperature: 0°C to 40°C
– Network connection: Ethernet

antminer-u1-idle-power-consumption

If you are using Bitmain AntMiner U1 USB Bitcoin ASIC miners there is something important that you should be well aware of in order to get the maximum performance and ensure optimal stability on the long run for these devices. Obviously we are going to be talking about power consumption and usage of these small ASIC miners that are designed to be powered by USB. The manufacturer has rated them at 2 watt power consumption from the USB port with a hasrate of 1.6 GH/s and tha is leaving you about 0.5W headroom for overclocking before reaching the maximum power that a normal USB 2.0 port can provide you with. But we decided to check if the Bitmain rating is rally true and to see for ourselves what is the actual power consumption of the AntiMiner U1 devices. As you can see on the photo above the power usage of the U1 miner is just 0.086A at 5V or a total of 0.43 watts is what you get with the device connected to a PC, but with no mining software running.

antminer-u1-cool-hot-power-consumption

As soon as you fire up cgminer or another compatible mining software and the AntMiner U1 starts working at 1.6 GH/s the power consumption increases significantly that what you get in idle mode. At first we’ve measured 0.385A current used or about 1.925 watts – a bit below the manufacturer’s rating, however this is the power usage while the device is still cool. Just a few minutes later since everything gets hotter (thermal images) after the AntMiner U1 starts operating and the power usage increases along with the temperature of the chips. In just about 10 minutes after starting to mine with the device the current usage increases to 0.405A or a total of 2.025W of power, something that does not seem that much higher at first, but as you start to overclock the device you will notice that the gap between a well cooled AntMiner U1 and a very hot miner increases. The problem is that the higher power consumption leads to more heat and can also result in less performance when overclocking.

Here are the results we’ve got as a power consumption of the AntMiner U1 device connected on a USB 2.0 port. Have in mind that USB 2.0 ports have a standard limit on maximum current they can provide to a connected device of 0.5A or 2.5W in total and this can lead to lower performance you can get when overclocking as you might be hitting the interface power limit and not the device’s:

1.6 GH/s – 0.405A
1.8 GH/s – 0.456A
2.0 GH/s – 0.505A
2.2 GH/s – ~~~~~~

We have moved the AntMiner U1 to a USB port to contnue with our overclocking experiments. Have in mind that USB 3.0 ports have an increased limit of the current they can supply to a device of 0.9A at 5V or 4.5W of power, so we could continue to overclock the USB ASIC further:

2.2 GH/s – 0.568A
2.4 GH/s – 0.633A
2.6 GH/s – 0.701A
2.8 GH/s – ~~~~~~

As you can see from the results above hitting 2.2 GH/s on a USB 2.0 port was not possible as we were hitting the limit of the power the interface can provide already at 2 GH/s. Moving to USB 3.0 we could squeeze up to 2.6 GH/s by increasing the operating frequency of the device and having more power available to use from the USB port. Have in mind that overclocking the device requires an adequate cooling to be provided, so you need to be prepared for that before starting to go past the “stock” 1.6 GH/s hashrate. As you can see from our results the maximum we could get was below the maximum power the USB 3.0 interface can provide, the reason for that is that for higher performance you would also have to increase the voltage that the processor of the device operates at (default 0.8V) in order for it to continue working fine at a higher frequency. This can be done by replacing two resistors on the device and the procedure is described in the AntMiner U1 manual. Have in mind though that increasing the voltage can damage the device, so do have in mind should you decide to go for a hardware modification for even higher performance. Increasing the voltage will also seriously increase the power consumption and will require even better cooling in order not to overheat the miner!

To download the Bitmain AntMiner U1 manual for additional details about overclocking…


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