Bitmain Antminer S21 official reference vs Bitmain Antminer S9 nine-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 nine-bin OEM reference runs 10.0 TH/s at 98.0 J/TH.
Specs verified against the D-Central Mining Bible \xc2\xb7 October 2026
Specifications Comparison
| Bitmain Antminer S21 official reference | Specification | Bitmain Antminer S9 nine-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 nine-bin OEM reference
Based on BTC price of $118,303 and current network difficulty as of Oct 11, 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 nine-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 nine-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 nine-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
Bitmain Antminer S21 official reference$4.60/day higher profit at current rates.
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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