Can this be used to connect to a sata connecto to use the 4 pin part to conect to a 4 pin to 3pin cable?

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Not really sure what you are asking. What are you trying to connect? This cable is used to provide the power connection for a Sata drive I, II, or III. Normally older power supplies either do not have a Sata power connector or do not have enough of them. This allows you to convert a MOLEX connector to use to power a sata drive. I have never seen a molex connector that only has 3 pins. If you are trying to some other connector on the power supply that only has 3 pins I would suggest to you that this is wrong or will not work. The only 3 pin connector I know of is usually for a fan.

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