Voltage Modify A2 Miner Board Guide
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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