Bitmain Antminer S21 official reference vs Bitmain Antminer S9 eight-bin OEM reference
Side-by-side specs, profitability, and home mining comparison.
Quick verdict
For most buyers the Bitmain Antminer S21 official reference is the stronger pick — Multiple generations of advancement deliver an overwhelming efficiency advantage. The Bitmain Antminer S21 official reference runs 200.0 TH/s at 17.5 J/TH; the Bitmain Antminer S9 eight-bin OEM reference runs 10.0 TH/s at 98.0 J/TH.
Specs verified against the D-Central Mining Bible \xc2\xb7 August 2026
Specifications Comparison
| Bitmain Antminer S21 official reference | Specification | Bitmain Antminer S9 eight-bin OEM reference |
|---|---|---|
| 200.0 TH/s | Hashrate | 10.0 TH/s |
| 3,500 W | Power Consumption | 980 W |
| 17.5 J/TH | Efficiency | 98.0 J/TH |
| — | Noise Level | 76 dB |
| 15.4 kg | Weight | 4.5 kg |
| 11,942 BTU/hr | BTU Output | 3,344 BTU/hr |
| — | Home Mining Score | — |
| — | Release Year | — |
| SHA-256 | Algorithm | SHA-256 |
| Bitmain | Manufacturer | Bitmain |
Profitability Comparison
Bitmain Antminer S21 official reference
Bitmain Antminer S9 eight-bin OEM reference
Based on BTC price of $79,883 and current network difficulty as of Aug 28, 2026. Actual results vary.
Verdict
A dramatic cross-generation comparison spanning nearly a decade of mining hardware evolution. The S9 defined an era; the S21 defines the current one.
The S21 is roughly 5-6x more efficient than the S9, producing far more hashrate per watt. The S9 is no longer profitable as a pure miner at any realistic electricity rate but remains popular as a Bitcoin-powered space heater through D-Central's Space Heater editions.
Spec Deltas
The Bitmain Antminer S21 official reference and Bitmain Antminer S9 eight-bin OEM reference diverge on the metrics below — each gap expressed as a real percentage, not a vague "better":
- Bitmain Antminer S21 official reference 1900% more hashrate (200.0 vs 10.0 TH/s)
- Bitmain Antminer S9 eight-bin OEM reference 72% better power draw (3,500 vs 980 W)
- Bitmain Antminer S21 official reference 82% better efficiency (17.5 vs 98.0 J/TH)
- Bitmain Antminer S9 eight-bin OEM reference 71% better weight (15.4 vs 4.5 kg)
- Bitmain Antminer S21 official reference 257% more heat output (11,942 vs 3,344 BTU/hr)
Best For...
Best for Profitability
TieBoth miners produce similar daily profit.
Best for Home Mining
TieBoth miners are equally suitable for home use.
Best for Efficiency
Bitmain Antminer S21 official reference17.5 J/TH — lower electricity cost per unit of hashrate.
Frequently Asked Questions
Is there any reason to still use an Antminer S9?
Yes — as a space heater. The S9's 1400W power consumption generates significant heat output. D-Central's Space Heater S9 Edition converts this into usable home heating while still mining BTC as a bonus, effectively subsidizing your heating bill.
How much more efficient is the S21 than the S9?
The S9 runs at approximately 98 J/TH while the S21 achieves around 17.5 J/TH. That is roughly 5.6x more efficient, meaning the S21 produces 5.6 times more hashrate per watt of electricity consumed.
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