Bitmain Antminer S21 Pro

Brand New Bitmain Antminer S21 Pro The Antminer S21 Pro is designed for serious Bitcoin miners who need more power, greater efficiency, and enhanced durability. The S21 Pro takes everything you know about the S19 and S21 series and turns it up a notch.Compact Yet More Powerful DesignWhile the original Bitmain Antminer S21 was similar in size to the S19 series, the S21 Pro is significantly larger and sturdier. With a net weight of 44 lbs, about 30% heavier than the S21, this model incorporates a wider body, longer hashboards, and a redesigned control board layout. Its larger and thicker packaging foam ensures the unit arrives safe, though it may take a little extra effort to unbox.Optimized Cooling with Larger FansThe Antminer S21 Pro uses four 140mm high-performance fans (compared to 120mm fans in previous models) to improve airflow and heat dissipation. This setup reduces RPM stress on the fans, improves longevity, and creates more overclocking headroom.Next-Generation PerformanceNormal Mode: 237.2 TH/s at 3702W with an efficiency of 15.6 J/THLow Power Mode: 192.6 TH/s at 2842W with an efficiency of 14.7 J/THThanks to fewer but far more powerful chips (65 chips vs. 108 in the S21), each chip hashes at approximately 1.2 TH/s, doubling the single-chip hashrate of the S21. This allows the S21 Pro to deliver top-tier efficiency for large-scale mining farms or high-end home setups.Improved Control Board & HashboardsBitmain redesigned the control board to fit the S21 Pro’s wider chassis. The new board cover uses two screws for easier maintenance, though the front panel no longer includes an LCD display. Hashboards feature aluminum backing with bolt-on heatsinks and improved thermal compound for consistent cooling performance.Reliable Power SupplyThe APW17 PSU powers the Antminer S21 Pro, maintaining stability even under high loads. With its efficient power delivery, it complements the miner’s robust cooling to maximize uptime and profitability.Why Choose the Antminer S21 Pro ?Next-generation ASIC miner with exceptional performance and efficiencyLarger fans and improved airflow for cooler operationReinforced design and packaging for added durabilityLow Power Mode for reduced energy costs without sacrificing hashrateIdeal for serious Bitcoin miners and professional mining operationsConclusionWith superior chips, bigger fans, and a redesigned layout, the Antminer S21 Pro delivers a significant boost over the S21 and S19 series. Whether you’re expanding your mining farm or upgrading existing hardware, this model offers maximum profitability, stability, and efficiency.Comes with ~1 year manufacturer warranty.PSU included – APW17Note: Antminer S21 Pro runs on 220-277V voltage, it will not operate on household 110-120V voltageSpecificationsProduct Glance ModelS21 Pro Algorithm | CryptocurrencySHA256 | BTC/BCHHashrate, TH/s234|245Power on wall @25°C, Watt3510Power efficiency on wall @25°C, J/TH15Detailed Characteristics Power supply Power supply AC input voltage, Volt(1-1)220~277Power supply AC input frequency range, Hz50~60Power supply AC input current, Amp20Adapted AC output power requirement, W4000Hardware Configuration Network connection modeRJ45 Ethernet 10/100MMiner size (length*width*height, w/o package),mm(2-1)450*219*293Miner size (length*width*height, with package),mm680*390*450Net weight, kg20Gross weight, kg22Noise@25℃，dBA76Environment requirements Operation temperature,°C-20~45Storage temperature,°C-20~70Operation humidity(non-condensing) , RH10%~90%Operation altitude, m≤2000 S21 Pro Mining Profitability Calculator Frequently Asked Questions Do you provide setup support? If you need setup support beyond the available instructions provided, we offer one-on-one setup/consulting services that can be purchased separately from our consulting page. We would be happy to guide you through the process. Is a power cord included with the miner Bitmain includes one power cord in the box with Antminer S21 Pro. This power cord is either a P33-P13 or C20 – P13 type. Your unit could have either one, and we have no way of knowing what’s inside the box for any specific unit. We recommend buying a cable seperately, to make sure you have one that works with your PDU.  How much overclocking is possible with Antminer S21 Pro ? With overclocking firmware, you can expect to get an additional 10-15% additional hashrate. I'm not getting the advertised 15J/T efficiency on stock settings. Is there something wrong with my miner? Mining efficiency is highly dependent on ambient air temperature. If your miner is pulling more power than expected, in most cases it is due to a higher ambient temperature. You can improve mining efficiency by preventing mixing of hot exhaust air with intake air.  Which control board does this miner come with? We’ve seen most units with AMLOGIC A113D control board. Does the fans on this miner have rectangular or square connectors? All 4 fans on Antminer S21 Pro have 4-pin square fan connectors. The fans are 140mm wide and much larger than those on previous antminers.  How can I make this quiet for home use? Stock fans on Antminers can be very loud (~75 dB) at full speed. There are however multiple ways to make them quieter. First way to make them quieter is to run them at substantial underclocking. This will significantly reduce the hashrate, but will also reduce fan noise, since the fans don’t have to run at full speed when underclocked. Another way to reduce noise is by replacing stock fans with an inline AC infinity fan. You can learn more about this here. This method allows running the miners on stock hashrates and may even allow some overclocking in many cases. Third way to reduce fan noise is by running the miners in immersion mode. In this method the miners are immersed in vats of mineral oil or dielectric fluid. This significantly improves heat transfer and enables substantial overclocking. Immersion mining however voids all warranty, is more complex to setup and immersion fluid can act as a solvent and damage some mining gear. We believe that this is still an experimental technology reserved for the most technically inclined. We do not recommend immersing Antminers to most customers for this reason. Stock Antminer firmware does not allow much flexibility in terms of overclocking/underclocking , fan control, automated temperature control etc. In most cases you would need aftermarket firmware to enable quieter operation.  Can you ship this directly to my hosting company? Yes, you can either take delivery yourself or ship this to your hosting company by providing their address under the shipping address field on checkout page.  Can you recommend a reputable hosting company? While we do not have our own hosting facility, as a Bitcoin mining hardware vendor, we regularly ship ASIC miners and repair parts to various hosting sites across the US. Here’s a list of some of the companies we’ve worked with:–BSLF Mining-Bounty Hunter Mining–Terra Hosting-Basic MiningThis list is a recommendation and not an endorsement for these hosting companies. Please do your own due diligence, before choosing a colocation host. Does this product have a factory warranty? The product is sold new, unopened with a factory warranty unless otherwise requested by the customer to upgrade to aftermarket firmware. Generally, the manufacturer provides a one-year warranty from the manufactured date. The manufacturer warranty period and limitations can be referenced by going directly to their website. For further information and links please view our blog post on warranty. Is this product covered by Altair Technology’s 14 day Warranty Against Defects? This item is excluded from the Altair Technology’s 14 day warranty. However, the manufacturer does provide a warranty. For more information we recommend referencing the manufacturers most updated policy directly from their website.