Hello, the card needs 120 watt, the 6pin connector is as far as I know only designed for 75 watt (but could also be more). you could try to get the necessary power with an adapter. e.g. there are double Molex to 8pin adapters, the power should be enough :)

There is usually an adapter included for 8 pin... had to look at the accessories. And make sure your power supply has enough wattage.

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