Quote from: dongamk on April 12, 2018, 06:38:33 PM

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

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

The Antminer s9 cant 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 (Antminers 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. Heres 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 wont be valid if you overclock the miner. Also, if you use an inappropriate power supply or generate environmental damage to your miner you wont be eligible for a warranty (e.g. corrosion due to wet environment).

thanks a lot doing all that maths for me. worth reading post. Very knowledgeable.

i really like your idea getting s7 on cheaper price, worth try.

Yes, It's all maths INVESTMENT and OUTPUT, do your calculation well and then enter into ring.