This document compares several GPU options for bitcoin mining in 2019 and provides their expected return on investment periods. It lists the Radeon RX 470, RX 480, RX 570, and RX 580 graphics cards from AMD along with their processing specs and ROI ranges of 158-341 days. It also includes the Nvidia GeForce GTX 1660 card with its specs and longer ROI period of 326-497 days.
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