Antminer S21 XP — Mining-Rentabilität
Überblick
The Antminer S21 XP is Bitmain's September 2024 air-cooled efficiency champion, delivering 270 TH/s at 13.5 J/TH and 3,645 W. It was the first widely-available sub-14 J/TH air machine, redefining the air-cooled benchmark and giving operators a credible alternative to hydro deployments without the loop integration overhead. Today it remains the reference air ASIC for hosting providers and mid-scale farms targeting post-halving viability. Within the Bitmain lineup it sits above the base S21 (200 TH/s, 17.5 J/TH) and below the S23 (318 TH/s, 11 J/TH) and S23 Hydro (580 TH/s, 9.5 J/TH). It competes head-to-head with the Whatsminer M70S (226 TH/s, ~14 J/TH) and the MicroBT M78S (472 TH/s, ~14 J/TH) on $/TH and J/TH benchmarks.
Glossar ansehen →Spezifikationen
Hashrate
270 TH/s
Leistung
3,645W
Effizienz
13.5 J/TH
Kühlung
Air
Veröffentlichung
September 2024
Est. $/TH
$21.5/TH
Hersteller
Bitmain
Live-Rentabilität
Auswirkungen des Halvings 2028
The April 2028 halving cuts the block subsidy from 3.125 to 1.5625 BTC, mechanically halving the hashprice. At today's hashprice ($39/PH/day), the Antminer S21 XP at 0.27 PH/s generates ~$10/day in gross revenue. Post-halving, that drops to ~$5/day at constant BTC price. Break-even electricity tightens from ~$0,119/kWh today to ~$0,060/kWh post-halving. At 13.5 J/TH, the S21 XP is one of the borderline-viable air machines after the halving — it survives at industrial rates ($0.05/kWh and below) but loses comfort in retail and grid-tied environments. Operators planning post-halving operations typically pair it with low-cost power contracts or relocate to ultra-cheap-energy regions.
Halving-Countdown ansehen →Mit ähnlichen Modellen vergleichen
Avalon A16
282 TH/s · 13.83 J/TH · Air
WhatsMiner M78S
472 TH/s · 13.88 J/TH · Air
WhatsMiner M70S
226 TH/s · 13.89 J/TH · Air
Häufig gestellte Fragen
Is the Antminer S21 XP profitable today?▾
At the current hashprice ($39/PH/day), the S21 XP generates ~$10/day in gross revenue. Net profitability depends linearly on electricity: at $0.04/kWh you keep a strong margin; at break-even ($0,119/kWh) you clear zero; above that, you lose money. The S21 XP is one of the most cost-efficient air ASICs to run today; below $0.06/kWh it remains a comfortable performer.
What's the break-even electricity cost for the Antminer S21 XP?▾
At the current hashprice ($39/PH/day), break-even sits at ~$0,119/kWh. The formula: daily revenue (0.27 PH/s × hashprice) divided by daily energy consumption (3.645 kW × 24h = 87.5 kWh) gives the kWh price at which gross revenue equals electricity cost. Apply 2% pool fee and the practical ceiling drops slightly. After the 2028 halving, break-even tightens to ~$0,060/kWh.
How does the 2028 halving affect the Antminer S21 XP?▾
The halving halves the hashprice. For the S21 XP at 0.27 PH/s, gross daily revenue drops from ~$10 to ~$5 at constant BTC price. Break-even electricity tightens from ~$0,119/kWh to ~$0,060/kWh. At 13.5 J/TH the S21 XP straddles the post-halving viability line — viable on industrial power, marginal on retail. Many operators pair the S21 XP with hosting contracts at $0.05/kWh or below to extend its productive lifetime past 2028.
What's the lifespan of an Antminer S21 XP?▾
Air-cooled ASICs typically last 4–6 years of continuous operation in a clean datacenter environment. Launched September 2024, the S21 XP is in its early life — units have 4–5 productive years ahead before sub-9 J/TH next-gen machines compress its margin. Plan a 4-year productive window with the 2028 halving as the inflection point. With its sub-14 J/TH efficiency, the S21 XP is one of the few 2024-era air machines positioned to remain economically relevant deep into 2028–2029 on industrial power.
Antminer S21 XP vs Whatsminer M70S — which one wins?▾
On efficiency they are within 3%: S21 XP at 13.5 J/TH (270 TH/s, 3,645 W) versus M70S at ~13.9 J/TH (226 TH/s, 3,140 W). The S21 XP wins on raw hashrate density per chassis (~20% more); the M70S is typically cheaper on $/TH at MSRP and on the secondary market. For a new buildout where rack space is constrained, the S21 XP's better density compounds; where rack space is cheap, the M70S' lower price-per-TH wins. Both are strong picks for post-halving viability on industrial-rate power.