🧊【Unboxing Review】Ant S21+ Hyd. 395T Powerful Premiere: Water-cooled Beast, Born for Hashrate! Hello everyone! Today, we bring you an eagerly anticipated water-cooled server—the Ant S21+ Hyd. (395T)—unboxing and hands-on experience. As another major achievement by Bitmain in water-cooling technology, the S21+ Hyd. not only continues the stable and efficient design DNA of its predecessor but also makes significant upgrades in energy efficiency and cooling system. Next, let’s uncover its mysterious veil together!📦 Unboxing Moment: Calm Industrial Style, Attention to Detail When the delivery guy seriously handed the large box to our editor Li Yi, I knew this server was extraordinary. Upon opening the package, the first thing that catches the eye is the main unit, protected tightly by foam. The chassis is made of silver-gray metal with sharp lines, and the overall craftsmanship is very solid. The entire machine measures 339 x 173 x 207 mm, weighs 12.3 kg, and feels very “steady” to handle. Inside the package, there are also installation instructions, water cooling pipe interfaces (DN10), and power cables, with complete accessories for hassle-free installation.🔧 Core Configuration Overview: 395TH/s Roaring Hashrate! Let’s first look at its core parameters: Item Parameter Algorithm SHA-256 Supported Coins BTC / BCH / BSV Typical Hashrate 395 TH/s (±3%) Power Consumption 6320W (±5% @35℃) Energy Efficiency 12.0 J/TH (35℃) 16.0 J/KH (25℃) Network Interface RJ45 Ethernet 10/100M Power Input 380-415VAC, three-phase, 50/60Hz, maximum current 12A From the data sheet, this S21+ Hyd. with 395TH/s is a “mining beast.” Although it consumes a lot of power, thanks to water cooling, its overall energy efficiency is very well-controlled, reaching top-tier market standards.💧 Water Cooling System Hands-On Testing: Calm as a Maiden, Cold as a Glacier As a server designed with pure water cooling, the S21+ Hyd. has strict requirements for inlet water temperature, water quality, and water pressure: Recommended inlet water temperature: 20~50℃ Recommended water flow: 8~10L/min Fluid used: antifreeze / deionized water / purified water pH value: 8.5~9.5 Initial conductivity: <20 μs/cm (should not exceed 100 μs/cm after running for a while) In actual testing, Li Yi’s team used a closed-loop cooling system, setting the water temperature at 35℃. The outlet water temperature remained stable, the chassis showed no obvious heat, fan noise was very low, and the operation was so quiet it didn’t feel like a server. Compared to the roaring air-cooled devices, it more resembles a silent workaholic, quietly processing massive hashrate.🧪 Actual Operation Experience: Stable! Cool! Fast! After connecting power and cooling water, it took less than a minute to reach stable operation. Checking the mining pool backend, the measured hashrate stabilized between 393~398TH/s with minimal fluctuation. Power meter showed about 6305W, basically consistent with official specifications. Network connectivity was smooth with no disconnections or link issues.💡 Special Surprise: The device almost has no noticeable vibration and no traditional server “battle noise,” making it almost silent when placed in a mining farm cooling cluster.✅ Usage Tips and Precautions: The power supply must be three-phase 380~415V input—do not use the wrong voltage! It’s recommended to use with industrial-grade dry coolers to keep water temperature within a reasonable range; regularly check the coolant’s conductivity and pH to protect the motherboard; environmental temperature should be adjusted according to outlet water temperature for stable operation.📢 Summary: The Cold-Blooded Warrior in the Mining Farm! The Ant S21+ Hyd. is undoubtedly a leader among high-hashrate water-cooled servers. Its impressive 395TH/s hashrate, high energy efficiency of 12 J/TH, and near-silent operation make it an ideal choice for medium to large mining farms. If you’re looking for a stable, quiet, and powerful server, it’s definitely worth serious consideration. If you enjoyed this review, please like, share, and leave your experience in the comments! Next time, our editor Li Yi will review “Bitmain’s Next-Generation Flagship Model.” Stay tuned!