Bitmain Antminer S21 XP Hyd vs MicroBT Whatsminer M66S
Mining profitability comparison for Bitcoin (BTC), Bitcoin Cash (BCH)
Verdict: Bitmain Antminer S21 XP Hyd vs MicroBT Whatsminer M66S
For Bitcoin mining, the MicroBT Whatsminer M66S is the more efficient choice, delivering roughly 4% more hashrate per watt than the Bitmain Antminer S21 XP Hyd. The MicroBT Whatsminer M66S draws 2235W less, cutting electricity costs by about $1371/year at $0.07/kWh. Bottom line: if power efficiency is your priority, the MicroBT Whatsminer M66S is the stronger pick — but confirm with your real electricity rate and current hardware prices below, since acquisition cost ultimately drives ROI.
Specifications
| Spec | Bitmain Antminer S21 XP Hyd | MicroBT Whatsminer M66S |
|---|---|---|
| Type | ASIC | ASIC |
| Algorithm | ||
| Hashrate (BTC) | 473 TH/s | 298 TH/s |
| Power Draw | 5676 W | 3441 W |
| Efficiency | 12 J/TH | 11.5 J/TH |
| Supported Coins | BTC, BCH | BTC, BCH |
| Release Year | N/A | N/A |
Hashrate & Efficiency per Coin
| Coin | Bitmain Hyd HR | MicroBT M66S HR | Power A | Power B | More Efficient |
|---|---|---|---|---|---|
| BTC | 473 TH/s | 298 TH/s | 5676 W | 3441 W | Whatsminer ✓ |
| BCH | 473 TH/s | 298 TH/s | 5676 W | 3441 W | Whatsminer ✓ |
Daily Electricity Cost at Different Rates
Electricity cost only (not including coin revenue). Lower is better for any given rate.
| Electricity Rate | Bitmain Antminer S21 XP Hyd | MicroBT Whatsminer M66S | Difference |
|---|---|---|---|
| $0.04/kWh | $5.45 | $3.30 | +$2.15 (B cheaper) |
| $0.06/kWh | $8.17 | $4.96 | +$3.22 (B cheaper) |
| $0.07/kWh | $9.54 | $5.78 | +$3.75 (B cheaper) |
| $0.1/kWh | $13.62 | $8.26 | +$5.36 (B cheaper) |
| $0.12/kWh | $16.35 | $9.91 | +$6.44 (B cheaper) |
| $0.15/kWh | $20.43 | $12.39 | +$8.05 (B cheaper) |
| $0.2/kWh | $27.24 | $16.52 | +$10.73 (B cheaper) |
Pros & Cons
Bitmain Antminer S21 XP Hyd
- Highest single-unit SHA-256 hashrate available (473 TH/s)
- Same 12 J/TH efficiency as the air-cooled S21 XP
- Near-silent operation (~45 dB) — noise managed by the liquid loop, not fans
- Requires Bitmain-compatible Liquid Distribution Unit (LDU) — significant extra cost
- 5,676 W draw demands serious electrical infrastructure (25+ A at 220 V)
- High acquisition cost (~$10,000–$14,000 per unit) limits accessibility
MicroBT Whatsminer M66S
- Best efficiency of any MicroBT air-cooled ASIC (11.5 J/TH)
- 298 TH/s — highest raw hashrate in MicroBT's air-cooled lineup
- Proven MicroBT reliability at scale; immersion variant available (M66S+)
- High acquisition cost (~$5,000–$6,500)
- 3,441 W draw requires dedicated high-amperage circuit
- MicroBT firmware ecosystem smaller than Bitmain's
Frequently Asked Questions
Is the Bitmain Antminer S21 XP Hyd or MicroBT Whatsminer M66S more profitable for Bitcoin mining?
Based on hashrate-per-watt efficiency, the MicroBT Whatsminer M66S is more efficient for Bitcoin mining. However, actual profitability depends on your electricity cost, hardware acquisition price, and coin price — use the live calculator for exact numbers.
What is the power consumption difference between the Bitmain Antminer S21 XP Hyd and MicroBT Whatsminer M66S?
For Bitcoin mining, the Bitmain Antminer S21 XP Hyd draws 5676 W while the MicroBT Whatsminer M66S draws 3441 W. The MicroBT Whatsminer M66S uses 2235 W less power, which at $0.07/kWh saves ~$1371 per year in electricity.
Can both the Bitmain Antminer S21 XP Hyd and MicroBT Whatsminer M66S mine the same coins?
Yes — both units can mine Bitcoin (BTC) and Bitcoin Cash (BCH). You can switch between these coins with a simple pool configuration change.
Which unit has a better ROI?
ROI depends on hardware acquisition price, electricity cost, and coin price trajectory. The more efficient unit (better J/TH or hashrate per watt) will generally have a lower operating cost per coin mined, but the absolute ROI timeline is determined by the purchase price. Always model both units in the MiningReturns calculator with your specific electricity rate and current market prices.
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Enter your electricity rate for live earnings estimates on both units.