Bitmain Antminer S9J is the one of the most popular and efficient bitcoin miner in the world comparing with all other ASIC competitions for Bitcoin Mining (SHA-256 Algorithm). Higher the hash power, the better your odds of the miner paying for itself within a reasonable time frame. Naturally, much depends on the Mining Difficulty and Bitcoin price.
The Bitmain original power supply for S9J is the recommended power supply for safe and efficient Bitmain Antminer S9J Bitcoin mining.
This is a very good miner.