I bought these to use my existing HDMI cables with some monitors that only have DVI outputs. Some cables have them on both ends (DVI->HDMI->DVI) and others only DVI->HDMI) - my GPU has a number of different types of connectors so I had to swap things around a bit to get all the monitors in connected. The adapters worked great no matter how confusing the fitting was, so I'm very happy with them.
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