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Antminer S19 series (used) vs Antminer S21

The Antminer S21 hashes about 2.1 times faster than the Antminer S19 series (used), so its chance of finding a block is about that many times higher. It also draws about 1.1 times the power (3500 W against 3250 W). Per terahash, the Antminer S21 is the most efficient at 17.5 J/TH. The Antminer S19 series (used) is the cheapest to buy, from about $250.

Antminer S19 series (used)
Antminer S21

True size

Antminer S19 series (used)
400 x 195.5 x 290 mm
Antminer S21
400 x 195 x 290 mm
Outer size without packaging, length x width x height as each maker lists it, all drawn to the same scale. The orange outline is a bank card (85.6 x 54 mm) for comparison. Sizes from Bitmain support (Antminer S19 series (used)) and Bitmain support (Antminer S21).

The numbers as charts

FIG. 1HashrateLonger bar, more guesses per second, better block odds.
Antminer S19 series (used)95 TH/s
Antminer S21200 TH/s
FIG. 2Power drawWatts at the wall in normal use. Shorter is quieter and cheaper to run.
Antminer S19 series (used)3,250 W
Antminer S213,500 W
FIG. 3EfficiencyJoules per terahash. Shorter bar means more hashing for the same electricity.
Antminer S19 series (used)34.2 J/TH
Antminer S2117.5 J/TH
FIG. 4First-year costLowest listed price plus one year of electricity at $0.20/kWh.
Antminer S19 series (used)$250 + $5,698 = $5,948
Antminer S21$2,500 + $6,136 = $8,636
PurchaseElectricity, 1 year

Every figure

Antminer S19 series (used)Antminer S21
Hashrate
95 TH/s200 TH/s
Power
3,250 W3,500 W
Efficiency
34.2 J/TH17.5 J/TH
Price range
$250 to $700$2,500 to $4,000
Electricity per year at 0.20/kWh
5,6986,136
Chip
Bitmain BM1398 in the original S19; later variants use newer Bitmain chipsBitmain BM1368
Cooling and noise
Four fans, front to back airflow. About 75 dBFour 120 mm fans, front to back airflow. About 75 dB
Connectivity
Ethernet (RJ45, 10/100 Mbit/s) onlyEthernet (RJ45, 10/100 Mbit/s) only
Power supply
Built-in PSU, 200 to 240 V AC. Will not run on 110 to 120 VBuilt-in PSU, 220 to 277 V AC
Size and weight
S19j Pro: 400 x 195.5 x 290 mm, 14.6 kg400 x 195 x 290 mm, 15.4 kg
Open source
No. Third-party firmware such as Braiins OS is availableNo
Release year
2020 (later variants up to 2023)2023

Electricity in the same currency as your price per kWh. Real draw and hashrate vary with firmware, tuning and room temperature.

Your odds

Small miners rarely find a block alone. The odds calculator shows the live chances for each one, solo or with the pool.

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