Product Overview

The Bitmain Antminer S19k Pro 120T is a high-efficiency variant of Bitmain’s S19k Pro series, delivering 120 terahashes per second of Bitcoin (BTC) SHA-256 mining. The “k Pro” designation marks a distinct step up in efficiency from the standard S19J Pro, achieving approximately 23 J/TH through Bitmain’s refined chip binning process applied to the S19 platform.

The S19k Pro series was introduced to bridge the efficiency gap between the S19J Pro+ and the then-upcoming S21 generation. By applying tighter chip selection to the established S19-era manufacturing process, Bitmain achieved improved power efficiency without requiring entirely new hardware infrastructure — meaning operators can integrate S19k Pro units into existing S19-compatible rack and power configurations.

For miners in South Africa, the S19k Pro 120T offers a compelling combination of solid hashrate, improved efficiency relative to older S19 variants, and a lower unit cost than the S21 generation — making it a practical choice for operators expanding capacity or replacing aging hardware on a controlled budget.

Key Features

• 120 TH/s hashrate: Delivers competitive Bitcoin mining output within the S19 efficiency class, well-suited to pool-based mining with reliable contribution to major pools.
• ~23 J/TH efficiency: At approximately 2760W, the S19k Pro 120T operates at roughly 23 J/TH — a marked improvement over the standard S19J Pro (29.5 J/TH) and on par with the S19J Pro+ in the same hashrate class.
• Air-cooled dual fan design: Standard S19-era rectangular chassis with dual industrial fans. Compatible with existing mining farm infrastructure, 19-inch rack systems, and standard S19-series PDUs.
• SHA-256d algorithm: Mines Bitcoin (BTC), Bitcoin Cash (BCH), and Bitcoin SV (BSV). Bitcoin (BTC) is the standard target for SHA-256 hardware given its network value.
• Existing S19 infrastructure compatible: Same form factor and power connector type as the wider S19 family, allowing operators to slot S19k Pro units into existing S19-configured racks without modification.
• Third-party firmware support: Compatible with advanced firmware options such as BraiinsOS+, enabling further efficiency tuning and enhanced monitoring for experienced operators.
• Ethernet (RJ-45) connectivity: Single wired port for pool communication. Web-based configuration interface accessible via local IP address.

Technical Specifications

• Algorithm: SHA-256d
• Supported coins: Bitcoin (BTC), Bitcoin Cash (BCH), Bitcoin SV (BSV)
• Hashrate: 120 TH/s (±3%)
• Power consumption: ~2760W (±5%) at 25°C ambient
• Power efficiency: ~23 J/TH (±5%)
• Cooling type: Air-cooled, dual high-speed fans
• Noise level: ~75 dB(A)
• Input voltage: 200–240V AC
• Networking: Ethernet (RJ-45)
• Operating temperature: 5°C to 45°C
• Dimensions (L×W×H): 400 × 195 × 290 mm
• Net weight: ~14.8 kg

Power & Installation Notes

South Africa’s 230V/50Hz power supply is within the Antminer S19k Pro 120T’s 200–240V input range. No voltage converter is required.

At approximately 2760W, the S19k Pro 120T requires a dedicated circuit — but at this wattage, a single unit can operate on a dedicated 16A circuit (rated at 3680W, though safely loaded to ~80% = 2944W). A qualified electrician should confirm circuit sizing for your specific installation, particularly if multiple units will share distribution infrastructure.

As with all high-wattage miners in South Africa, load shedding must be planned for. At 2.76 kW, a 10kWh home battery could theoretically support approximately 3.5 hours of mining — but this rapidly depletes available backup capacity. For commercial operations targeting 24/7 uptime, a generator or commercial-grade UPS is necessary.

Ventilation requirements are consistent with other S19-series miners: clear airflow at both inlet and exhaust, ambient temperatures below 40°C, and active air extraction for enclosed mining spaces. In South African summer conditions, active cooling (air conditioning) may be necessary in sealed rooms.

Electricity Cost Context — South Africa

Running the Antminer S19k Pro 120T at 2760W continuously consumes approximately 66.2 kWh per day, or roughly 1 987 kWh per month. At R2.80/kWh (indicative residential tariff — varies by municipality), the estimated monthly electricity cost is approximately R5 563 per month.

Calculation: (2760 ÷ 1000) × 24 × 30 × R2.80 = ~R5 563/month.

The S19k Pro 120T’s 23 J/TH efficiency makes it more cost-effective to operate than older S19 Pro or S19J hardware at the same electricity tariff. Still, standard South African residential tariffs make large-scale home mining marginal at best — commercial or industrial tariffs, or access to renewable energy, significantly improve the operating economics.

Ideal Use Cases

• Budget-conscious operators upgrading from older S19-era hardware: The S19k Pro 120T offers meaningful efficiency gains over the S19 Pro and S19J Pro at a lower cost than transitioning to S21-generation machines.
• Commercial Bitcoin pool mining: Works reliably with all major SHA-256 pools. Suitable for any operation from a handful of units to large-scale farm deployment.
• Operators with existing S19 infrastructure: Identical rack footprint and power connector type means zero infrastructure modification required when integrating S19k Pro units alongside existing S19J Pro hardware.
• Firmware optimisation enthusiasts: BraiinsOS+ compatibility allows experienced operators to push efficiency beyond stock firmware levels through per-chip autotuning.
• South African operators with commercial power tariffs: The 23 J/TH efficiency makes this miner viable at electricity rates below R2.00/kWh, which is achievable on commercial or industrial tariff structures in most SA municipalities.

Frequently Asked Questions

Does the Antminer S19k Pro 120T work on South African power?
Yes — it is fully compatible with SA’s 230V/50Hz supply. A dedicated 16A–20A circuit from a registered electrician is recommended for single-unit installations.

What is the difference between the S19k Pro 115T and 120T?
Both units share the same chassis, cooling design, and efficiency class (~23 J/TH). They differ only in hashrate binning — 115 TH/s versus 120 TH/s. The 115T is available at a lower price point. See: Bitmain Antminer S19k Pro 115T.

How does the S19k Pro compare to the newer S21 series?
The S21-generation miners (S21 Pro, S21 XP) offer 15–18 J/TH efficiency, significantly better than the S19k Pro’s 23 J/TH, but at a higher unit cost. The S19k Pro is more accessible for operators who are price-sensitive and willing to accept higher electricity cost per terahash.

What pools are compatible with the Antminer S19k Pro?
All major SHA-256 Bitcoin pools work with this miner: Foundry USA Pool, AntPool, F2Pool, ViaBTC, and Braiins Pool. Configuration is straightforward via the miner’s web interface.

Can I run the S19k Pro 120T at reduced power to lower electricity costs?
Yes. Bitmain’s firmware includes power-saving modes, and BraiinsOS+ provides more granular per-chip control. Reducing power consumption lowers hashrate proportionally but can improve the electricity cost-per-terahash ratio at higher tariff rates.

What’s Included

• 1× Bitmain Antminer S19k Pro 120T ASIC miner unit
• Integrated or separately shipped PSU (confirm with order)
• Power cable (region-specific — South African plug may require local adaptor or electrician wiring)
• Ethernet cable not included
• Quick-start guide