Bitmain delivers their Bitcoin miners in batches. Every batch is different than the other and also has a different hash rate. So it’s extremely possible that you’ll find yourself buying an Antminer s9 that has a hash rate of only 11.85 TH/s and not 14 TH/s. That’s why it’s important to know the specifications of the exact miner you’re looking into before buying it.

NOTE: make sure to know the EXACT specifications of the miner you’re buying. This way you will know to calculate the exact ROI and when you will break even.

The Antminer s9 can’t just be plugged into the wall, it needs a PSU (power supply unit). So whenever you purchase an Antminer keep in mind that you will need to spend a PSU. Bitmain (Antminer’s manufacturer) recommends using APW3-12-1600-B2.

Seeing as most people will probably rush to buy the new Antminer s9 you may want to consider getting the older model (Antminer s7) at a discounted price due to lower demand. The Antminer S7 has about 33% of the hashing power of the s9 (it runs at 4.73 TH/s) but if you buy 3 used ones it will probably cost less. Here’s what one experienced miner had to say about the Antminer s9.

Bitmain supply their customers with a 90 day warranty, however that warranty comes with limitations. For example, the warranty won’t be valid if you overclock the miner. Also, if you use an inappropriate power supply or generate environmental damage to your miner you won’t be eligible for a warranty (e.g. corrosion due to wet environment).