Voltage Modify A2 Miner Board Guide
A2 sillicon miner used to be one of the best on the market. You can still buy those bitcoin miners cheap on ebay and here is a guide on how to mod their voltage. Later they made A2 mini scrypt miners on cheaper price but you can still get them,
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L7 Trade Project Review - Unique Multi-Currency Inter-P2P Exchange! Trading without loss Only profit!
https://steemit.com/bitcoin/@koliunia/l7-trade-project-review-unique-multi-currency-inter-p2p-exchange-trading-without-loss-only-profit