Antminer S21 XP (270Th)

The S21 XP delivers 270 TH/s of SHA-256 hashrate at 3,645W wall draw, achieving 13.5 J/TH efficiency. Bitmain rates the unit at plus or minus 3 percent on hashrate and plus or minus 5 percent on power, meaning real world output typically runs between 262 and 278 TH/s depending on ambient temperature and voltage stability. This is the highest hashrate and best efficiency available in Bitmain's current air cooled S21 family.

The S21 family stacks as follows. Standard S21: 200 TH/s at 17.5 J/TH. S21+: 235 TH/s at 16.5 J/TH. S21 Pro: 234 TH/s at 15.0 J/TH. S21 XP: 270 TH/s at 13.5 J/TH. S21 XP Hydro: 473 TH/s at 12.0 J/TH (hydro cooled). The air cooled S21 XP is the most efficient air cooled option by a meaningful margin. The S21 Pro at 15.0 J/TH offers 90 percent of the XP's efficiency at lower acquisition cost, making it the value sweet spot for budget conscious buyers. The S21 XP is the correct choice when long term electricity cost per terahash matters more than upfront hardware price.

40 dB is roughly the volume of a quiet library or a modern refrigerator. Standard air cooled miners at 200+ TH/s produce 75 dB, which is industrial noise requiring dedicated facilities. The S21 XP at 40 dB is approximately 90 percent quieter in perceived loudness. That difference opens real deployment options: a spare room with the door closed, a home office, a garage, or a small commercial space with ambient noise restrictions. You still need adequate ventilation for 3,645W of continuous heat output, but noise stops being the limiting factor for placement decisions.

Universal 100 to 240V AC input. At 220V the unit draws approximately 16.6 amps, fitting standard commercial and most residential circuits globally. At 110V it draws about 33.1 amps, requiring a dedicated 40 amp circuit in North American residential settings. Have a licensed electrician install the dedicated circuit if needed. The PSU ships included with the miner along with power cables appropriate for your region. Ethernet connectivity completes the setup.

Any SHA-256 cryptocurrency. Bitcoin (BTC) is the primary target because it has the largest market and deepest mining pool infrastructure. Bitcoin Cash (BCH), Bitcoin SV (BSV), and Fractal Bitcoin also use SHA-256 and accept hashrate from the S21 XP through standard Stratum protocol. Connect to Foundry USA, F2Pool, AntPool, ViaBTC, or any major SHA-256 pool through the Bitmain web management interface over Ethernet.

At current Bitcoin network difficulty and price, the S21 XP generates approximately $9 to $10 per day in gross mining revenue at 270 TH/s. Daily electricity runs roughly $6.12 at $0.07 per kWh or $3.50 at $0.04 per kWh industrial rates, netting daily profit between $3 and $6 depending on your power cost. These numbers shift constantly with Bitcoin price and network difficulty. Always run fresh calculations through a current mining profitability calculator before purchasing. The 13.5 J/TH efficiency means the S21 XP stays profitable at electricity rates where older S19 generation hardware has already crossed below breakeven.

The premium buys two things: efficiency and quiet. At 13.5 J/TH versus 15.0 J/TH (S21 Pro), the S21 XP saves roughly 10 percent on electricity per terahash mined over the life of the machine. Over 3 years of continuous operation at $0.07 per kWh, that efficiency gap translates to approximately $600 to $800 in cumulative electricity savings per unit. The 40 dB noise level versus 75 dB on other S21 models adds deployment flexibility that has real dollar value for operators who would otherwise need to pay for hosting or build sound isolated rooms. Whether the acquisition premium is justified depends on your specific power rate, deployment environment, and planned operating duration.

Yes, and more comfortably than most Bitcoin miners. The 40 dB noise level is quiet enough for a spare room, home office, or garage without specialized sound insulation. You need a circuit that can handle 3,645W continuous (a dedicated 240V/20A circuit at minimum, or a dedicated 110V/40A circuit in North America). Ventilation must handle the heat output, which is equivalent to roughly two and a half standard space heaters running continuously. The 5 to 45 degrees Celsius operating range accommodates most home environments including unheated garages in moderate climates. For home miners, the S21 XP is realistically one of the most home friendly Bitcoin miners at this hashrate available from any manufacturer.

MicroBT's current M70 generation air cooled options include the M72S at 264 TH/s and approximately 14.5 J/TH. The S21 XP produces slightly more hashrate (270 versus 264 TH/s) at better efficiency (13.5 versus 14.5 J/TH). The noise advantage is where the S21 XP separates: 40 dB versus 75 dB standard on MicroBT air cooled hardware. For operations where noise matters, the S21 XP has no direct competitor from any manufacturer. For pure efficiency comparison in industrial noise tolerant environments, the difference between Bitmain and MicroBT at this tier is modest and comes down to pricing, distributor relationship, and firmware preference.

Every S21 XP from MillionMiner ships brand new, factory sealed, with full Bitmain manufacturer warranty. PSU and power cables are included in the box. MillionMiner ships DDP (Delivered Duty Paid), which means all customs clearance, import duties, value added tax, and import fees are handled and included in the purchase price. You pay one number at checkout and the miner arrives at your facility without additional charges. Warranty claims route through MillionMiner's support team. Hosting at managed facilities with competitive industrial electricity rates is also available for operators who want turnkey Bitcoin mining without building their own infrastructure.