Best answer: Mining Bitcoin with a GPU is no longer a profitable endeavor and your money is better spent on a dedicated ASIC miner.
Amazon: AntMiner S9i ($599)
GPU Bitcoin mining has been surpassed for most people
Mining Bitcoin is a harder task than it used to be. Unless you're going to build a serious rig with a lot of GPUs in it, it's not really worth the time.
Using a single GPU to process the algorithm for Bitcoin won't be profitable, as the return is so low, especially compared to the cost of buying the GTX 1080 Ti, and the power to run the machine its attached to.
Other cryptocurrencies can be mined with GPUs, but for Bitcoin, other methods are required. The time it takes to mine Bitcoin would far exceed the life of the graphics card.
An ASIC miner doesn't require a PC
One of the more accessible ways for folks to jump in and do a little home mining is with an ASIC miner. These don't require a PC and are a self-contained unit with a dedicated power supply, built purposely for mining using the SHA-256 algorithm.
The miner will have a simple web interface you can interact with on your regular PC, but for the purposes of mining, it can just sit there doing its own thing.
Your returns will vary depending on the power of your miner, of course. The better the hash rate, the more you'll be paying.
An ASIC miner is around the same cost as a GTX 1080 Ti
A beginner ASIC miner like the AntMiner S9i with a power supply is around the same price as a GTX 1080 Ti. The difference is you'll get better returns, and have lower overheads since you're not powering an entire PC. ASIC miners are much more power efficient.
It's a fairly small unit, too,
There's also the simple fact that this is a really intensive process, and a dedicated miner won't be taking up any of the resources on your PC. By contrast, mining on your personal PC is going to take its resources away from work or gaming.
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