Bitmain has unveiled a new bitcoin mining machine, the U3S21EXPH, with a reported hashrate of 860 terahash per second (TH/s). The new model represents a major step up from the company’s hydro-cooled Antminer S21 XP Hydro, which is rated at 473 TH/s. Based on those figures, the latest machine delivers roughly 81.81% more hashrate than its predecessor.
The longer-term comparison is even more striking. Bitmain’s first ASIC bitcoin miner, the Antminer S1, launched in 2013 with a hashrate of just 180 gigahash per second, or 0.18 TH/s. Compared with that early machine, the new 860 TH/s unit is 477,677% more powerful, underscoring how dramatically mining hardware has evolved over the past decade.
Bitcoin’s Network Growth Mirrors the ASIC Arms Race
The release comes against the backdrop of a much larger bitcoin mining network than the one miners knew in 2013. According to the source material, Bitcoin’s seven-day simple moving average hashrate reached an all-time high of 693 exahash per second (EH/s) on Sept. 7, 2024. That is equivalent to 693,000 petahash per second (PH/s) or 693,000,000 TH/s.
By comparison, in November 2013 the Bitcoin network was operating at only about 5 PH/s, or 5,000 TH/s. At that time, the Antminer S1 had just entered the market as Bitmain’s first application-specific integrated circuit miner. Its output of 0.18 TH/s now looks tiny beside modern systems, but it reflected the early phase of industrial ASIC competition.
That competition accelerated quickly. A few months after the S1, Bitmain launched the Antminer S2, pushing the benchmark to 1 TH/s. Throughout 2014, the company released the S2, S3, S4, and S5, while other manufacturers including Kncminer, Hashcoins, Butterfly Labs, Asicminer, Canaan, and Gridseed competed for relevance in the fast-growing mining hardware market.
From S9 Dominance to a New Performance Leap
By late 2016 and into 2017, Bitmain’s S9 lineup became one of the most recognizable generations of bitcoin miners. These models offered hashrates ranging from about 10 TH/s to 14.5 TH/s. At their peak, estimates cited in the report suggest that S9 machines powered more than half of the Bitcoin network’s total hashrate, illustrating both Bitmain’s market influence and the concentration of hardware adoption at the time.
The competitive landscape shifted again as some early mining hardware firms failed to maintain their positions. According to the article, many of the once-visible ASIC vendors did not remain active in the sector, leaving Bitmain and Canaan as some of the more enduring names. During the S9 era, Bitmain still faced meaningful competition from companies such as Bitfury, Innosilicon, Canaan, and Ebit.
The economics looked very different back then. In March 2018, Bitfury’s B8 miner, running at around 49 TH/s, was estimated to generate about $32.54 per day in profit. During the same period, a 14 TH/s Antminer S9 was reportedly generating roughly $10.83 per day. Those figures reflected a market environment in which older hardware could still earn positive returns under favorable conditions.
Older Machines Are Being Squeezed
That is no longer the case for many legacy miners. The report notes that by September 2024, with hashprice at $0.0438 per TH/s and power costs assumed at $0.04 per kWh, the once-dominant Antminer S9 would now be losing about $2.70 per day. This contrast illustrates one of the defining realities of bitcoin mining: hardware depreciation is relentless, and even iconic machines can become economically obsolete.
For operators still running older fleets, the shift highlights the pressure created by rising network hashrate and increasing machine efficiency standards. As newer miners produce substantially more output per unit, low-efficiency devices struggle to remain viable unless they have access to exceptionally cheap power or other operational advantages.
How the U3S21EXPH Compares
Before this week’s announcement, one of Bitmain’s flagship hydro miners was the Antminer S21 XP Hydro, which delivered 473 TH/s. The article says its closest notable competitor was Microbt’s hydro-cooled M63S+, rated at around 450 TH/s. Bitmain’s newest model significantly raises the bar by adding another 387 TH/s on top of the S21 XP Hydro’s stated output.
At an electricity cost of $0.04 per kWh, the U3S21EXPH is projected to earn about $34.36 in daily profit, according to the source. That estimate excludes the upfront purchase price, which remains a critical factor in assessing real return on investment. The article adds that older Bitmain models are currently being sold at roughly $23 to $27 per TH/s. Using the low end of that range as a rough reference point, one of the new 860 TH/s machines could cost a buyer around $19,780.
That price estimate is not presented as a confirmed retail figure for the new model, but rather as an approximation based on the company’s pricing for older units. Even so, it signals the scale of capital required to participate in the latest generation of industrial mining.
No Clear Performance Ceiling Yet
The most important takeaway from the latest launch may be what it suggests about the state of ASIC development. The jump from 473 TH/s to 860 TH/s indicates that manufacturers are still finding room to push performance higher. In other words, the ceiling for bitcoin mining hardware has not been reached yet.
The article frames this as another sign that the so-called zettahash era may be drawing closer. As increasingly powerful machines come online, the Bitcoin network’s aggregate hashrate could continue to rise, especially if operators with access to low-cost infrastructure deploy these newer systems at scale.
Still, higher machine performance does not automatically guarantee better economics for all miners. Profitability remains tied to a mix of variables including the bitcoin price, network difficulty, total network hashrate, electricity costs, and the speed at which hardware loses its competitive edge. A more powerful miner can improve revenue potential, but margins can still narrow quickly if competition intensifies or if the broader market environment shifts.
A Snapshot of the Industry’s Transformation
Seen in historical context, the path from the 0.18 TH/s Antminer S1 to an 860 TH/s machine captures the transformation of bitcoin mining from a relatively accessible hardware niche into a capital-intensive industrial sector. Over roughly eleven years, machine output has surged by several orders of magnitude, while the network itself has expanded from a few thousand terahash to hundreds of millions of terahash.
That evolution has reshaped the economics of participation. It has also narrowed the window during which any given machine can remain competitive. Models that once dominated the network, such as the S9, are now examples of how quickly mining equipment can age out of profitability.
For Bitmain, the release of the U3S21EXPH reinforces its role as one of the most influential manufacturers in the ASIC market. For the industry, it is another reminder that mining remains an arms race driven by efficiency, scale, and constant hardware innovation. And for miners, the latest benchmark raises a familiar question: how long can the pace of improvement continue before the next major leap arrives?