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Antminer S21

Antminer S21

Hashrate 200.0 TH/s Power 3,500 W Efficiency 17.5 J/TH
VS

MicroBT WhatsMiner M76S+

Hashrate 416.0 TH/s Power 5,200 W Efficiency 12.5 J/TH

Antminer S21 vs MicroBT WhatsMiner M76S+

Side-by-side specs, profitability, and home mining comparison.

Specifications Comparison

Antminer S21 Specification MicroBT WhatsMiner M76S+
200.0 TH/s Hashrate 416.0 TH/s
3,500 W Power Consumption 5,200 W
17.5 J/TH Efficiency 12.5 J/TH
75 dB Noise Level 75 dB
14.6 kg Weight 18.0 kg
11,942 BTU/hr BTU Output 17,742 BTU/hr
36/100 Home Mining Score 30/100
— Release Year —
SHA-256 Algorithm SHA-256
Bitmain Manufacturer MicroBT

Profitability Comparison

$/kWh

Antminer S21

Daily Revenue 0.00009204 BTC $7.28
Daily Electricity -$8.40
Daily Profit -$1.12
Monthly -$33.64
Yearly -$409.23

MicroBT WhatsMiner M76S+

Daily Revenue 0.00019144 BTC $15.14
Daily Electricity -$12.48
Daily Profit $2.66
Monthly $79.80
Yearly $970.87

Based on BTC price of $79,086 and current network difficulty as of May 15, 2026. Actual results vary.

Verdict

Weighing six performance factors, the MicroBT WhatsMiner M76S+ comes out ahead — it takes 2 of 4 (efficiency, hashrate). The standout gap is 108% more hashrate (200 vs 416 TH/s) in the MicroBT WhatsMiner M76S+'s favour. That said, the Antminer S21 isn't beaten everywhere — it still wins power consumption and home mining score. Review the detailed specs and profitability calculations above to determine which miner best fits your specific setup.

Winner: MicroBT WhatsMiner M76S+ — wins on 2 of 4 factors

Spec Deltas

Stripped to the numbers, this is how far apart the Antminer S21 and MicroBT WhatsMiner M76S+ sit on each measurable spec:

  • MicroBT WhatsMiner M76S+ 108% more hashrate (200 vs 416 TH/s)
  • Antminer S21 33% better power draw (3,500 vs 5,200 W)
  • MicroBT WhatsMiner M76S+ 29% better efficiency (17.5 vs 12.5 J/TH)
  • Antminer S21 19% better weight (14.6 vs 18.0 kg)
  • MicroBT WhatsMiner M76S+ 49% more heat output (11,942 vs 17,742 BTU/hr)
  • Antminer S21 20% more home mining score (36.0 vs 30.0)

Cost & ROI Over Time

Sticker price versus what the miner actually earns back: the table below projects cumulative net profit at a $0.10/kWh electricity rate.

Antminer S21 Metric MicroBT WhatsMiner M76S+
$5,500 Upfront cost (MSRP) —
-$1.12 Daily net profit $2.66
-$5,909 Net after 1 year +$971
-$6,318 Net after 2 years +$1,942
-$6,728 Net after 3 years +$2,913
Does not pay back at current rates (negative daily profit) Payback period —

Projections assume continuous operation, a flat $0.10/kWh rate, and no hardware degradation, pool fees, or BTC price change. Real-world ROI varies.

Best For...

Best for Profitability

MicroBT WhatsMiner M76S+

$3.78/day higher profit at current rates.

Best for Home Mining

Antminer S21

Score: 36/100. 75 dB noise level.

Best for Efficiency

MicroBT WhatsMiner M76S+

12.5 J/TH — lower electricity cost per terahash.

Frequently Asked Questions

Is the Antminer S21 or MicroBT WhatsMiner M76S+ more profitable?

At the current BTC price and a $0.10/kWh electricity rate, the MicroBT WhatsMiner M76S+ is more profitable at $2.66/day compared to $-1.12/day for the Antminer S21. Profitability depends heavily on your electricity rate — use the selector above to calculate with your actual costs.

Which is quieter, the Antminer S21 or MicroBT WhatsMiner M76S+?

Both miners have similar noise levels. Check the specs table above for exact decibel readings.

For mining at home, should I pick the Antminer S21 or the MicroBT WhatsMiner M76S+?

The Antminer S21 scores 36/100 on our Home Mining Score (vs 30/100 for the MicroBT WhatsMiner M76S+). This composite score factors in noise, power requirements, heat output, size, and setup ease — all critical for residential mining.

What is the efficiency difference between Antminer S21 and MicroBT WhatsMiner M76S+?

The Antminer S21 runs at 17.5 J/TH while the MicroBT WhatsMiner M76S+ runs at 12.5 J/TH — a difference of 5.0 J/TH. Lower efficiency means less electricity per terahash of mining power, directly reducing operating costs. In relative terms that is 29% better efficiency (17.5 vs 12.5 J/TH).

Compare Antminer S21 with...

Compare MicroBT WhatsMiner M76S+ with...

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