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Antminer S9j – the most power-efficient Bitcoin miner

The latest Antminer to be released by the leading supplier Bitmain, the Antminer S9j – 14.5 TH/s. Some say this is the most power-efficient Bitcoin miner out there. There are three versions of the Antminer S9j, the 13 TH/s, the 13.5 TH/s and the 14.5 TH/s. However, from the official website Bitmain, you can only purchase the latest 14.5 TH/s version of the S9j, so this is what we will be focusing on. If you decide to purchase one you can have it delivered as short 2 weeks from the date of purchase.

Currently being sold at $625 with a PSU, it is incredibly affordable. It mines the algorithm SHA-256 so you can mine Bitcoin and any other coin using the SHA-256 algorithm. A few good alternatives would be: Peercoin, Bytecoin, Crown, and using the nicehash platform.

How does it fare to previous models?

Compared to the other S9 Antminers, this does not have a huge advantage over the others. The standard S9 14.0 TH/s has a rating of 98W per 1 TH/s, while the S9i 14.0 TH/s has a rating of 94.29W per 1 TH/s. The S9j 14.5 TH/s beats both of these if only by a slim margin, with a rating of 93.10W per 1 TH/s. If you are going to buy a miner, it is recommended to get the S9j. This is for a number of reasons, most of which results in a higher profit margin.

How to set up an Antminer?

Going through each step in-depth will take a considerable amount of time so we’ll take you through a short instruction guide instead. You’re going to need a bitcoin address, an Antminer, and a mining pool. Getting these things setup can be somewhat of a task if you’re not sure what you’re doing, but once you’ve done this once before it becomes relatively simple.

You’re going to get a Bitcoin wallet, I recommend using Electrum for its simplicity. Then you’ll need to setup a worker on your mining pool and point the worker to mine to the new address you generated in your wallet. Once this is done, you need to get your antminer and connect it to the internet. This will then have an IP address, which you’ll need to login to your miner and get it setup. The default username:passwood is simply root:root.

Once you’ve logged in, you’ll need to setup a static IP as opposed to one defined by your DHCP server. Lastly, you simply need to point it to mine to your mining pool with your created worker account. This should then be fully setup, as which point you can get its statistics on your mining pool’s information panel.

So how much can I make?

The biggest problem with mining nowadays is the cost of electricity. Depending on where you live and the cost of electricity in your area, you could either be making a huge profit or you could be losing money by mining. Another thing you have to consider when buying a miner is that the difficulty is always increasing. In the past 9 months the mining difficulty on Bitcoin has risen by over 300%! That means if you were making $6 a day 9 months ago, then you’d be making $1.5 a day today.

If we assume a cost of 6 cents per KWh and a 10% rise in difficulty every month, then we can predict the ROI (Return on investment) to be ~10 months. While if you have a cost of 12 cents per KWh, then you’d never reach ROI.

The best use case for this miner is in a mining rig. Seeing as you can make a maximum of $5 a day, after 10 months, this could be reduced to a mere $1.20 a day. It works to have just one setup to make a bit of money on the side. But, you won’t be making a huge amount of money unless you buy these in bulk.