New BitMain Antminer A3 Blake (2b) ASIC Miner Announced

17 Jan

This came as a bit of unexpected surprise, but it seems that BitMain already has a working ASIC miner for the Blake (2b) mining algorithm (and maybe even for other variants of Blake) and they have announced their plans to start shipping the Antminer A3. The Blake 2b crypto algorithm is currently being used by SiaCoin (SC) and last year there was a pre-order for an official SiaCoin ASIC miner the Obelisk SC1. BitMain’s ASIC miner however seems to be arriving much earlier with similar specifications and price, so anyone that has pre-ordered an Obelisk SC1 might not be that happy. On the other hand people that are interested in getting into mining SiaCoin and missed their chance with the pre-order might order now from BitMain and get the device shipped in 10 days after payment according to the company.

BitMain Antminer A3 Specifications:
– Product model: A3
– Hash ASIC type: BM1720
– Hashing algorithm: Blake(2b)
– Total quantity of hash chips: 180 chips
– Total quantity of hash boards: 3 boards per miner
– Total hash rate: 815 GHS ±5%
– DC voltage input: 11.60~13.00 V
– DC current input @12V DC: 98.8 A +7%
– DC Power @12V DC input: 1186 W +7%
– 220VAC Power @25℃, 93% conversion efficiency of APW3: 1275 W + 7%
– 220VAC Power efficiency @25℃,93% conversion efficiency of APW3: 1.56 mJ/MH + 7%
– Weight (without package): 4.2 kg
– Operation temperature: 0-40 ℃
– Storage temperature: -40-85 ℃
– Operation humidity: 5%RH – 95%RH, prevent condensation
– Noise: 76 dB
– Networking connection mode: Ethernet Cable
– Power connection mode: All three PCI-E ports are required to power the board. You can use one PSU to power multiple boards, but do not attempt to power one board with two PSUs. We suggest to prevent the control board to be powered up before hash boards be powered up.
– Size (Length*Width*Height, without package): 321mm*125mm*208mm

For more details about the new BitMain Antminer A3 Blake (2b) ASIC miner…

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5 Responses to New BitMain Antminer A3 Blake (2b) ASIC Miner Announced


January 18th, 2018 at 09:15


January 19th, 2018 at 07:00

ya…these might be profitable for batch one, but they’re less than 1/2 as efficient as Oblisk’s. Future batches will need to be vastly improved


January 21st, 2018 at 15:33

I am selling preorder for 3 pieces of A3 for low price here:

or you can pay with bitcoin here:

You are fully covered with escrow service and buyer protection. For further info contact me through shopping websites I provided you here…

Aleks Clark

January 22nd, 2018 at 17:05

Hey guys, welcome to the sia community!

We recommend staying away from antpool or f2pool, and going with some existing community-run pools: (small, gives some cash to our sia dev team) (larger, biggest pool)

there is a complete list here:

We really want to avoid bitcoin’s governance problems, so please pick small pools and help us stay decentralized!


January 23rd, 2018 at 20:54

You still make money with mining? Or the energy invoices eat up all mined coins?

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