Re: please help - installing nvidea 7900GT
You plug the '2x2' end of the Y-connector into the graphics card and you are suppose to connect both of the 4-pin molex connectors to two open molex connectors from your PSU. This will result in the best amount of power being delivered to the vid card. But if you don't have two free 4 pin molex connectors, connecting one is fine and will not do damage to the card. If you do, however, experience power issues then you may have to find a way to connect both but I don't think you will have problems as long as the PSU is rated high enough for that card.
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