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In terms of performance, 280X is better. However, I don't think there is a stock 280X coming with 2x6pin. So no matter it's a 6+8 or 8+8 config, it's technically outside the cMP's spec.

The 7950 is slower, but there is some (only some, NOT all) 7950 come with 2x6pin which fits the cMP's spec.
 
Thanks for reply. I don't understand what those connectors are for. What is the practical difference in a card with 2X6pin versus one without? I see you have one of each. If I can find a 7950 with 2X6pin should I would that be better than a card without 2X6pin?
 
These are the spec for the graphic card's power supply.

The Mac Pro only has two 6pin power source, each of them are rated up to 75W.

A single 6pin power plug on the card may draw up to 75W, and a 8 pin up to 150W.

Therefore, theoretically, the cMP can only power a single 8pin card, or 2x6pin card.

Some 7950 are 2x6pin, that will fit the cMP.
 
These are the spec for the graphic card's power supply.

The Mac Pro only has two 6pin power source, each of them are rated up to 75W.

A single 6pin power plug on the card may draw up to 75W, and a 8 pin up to 150W.

Therefore, theoretically, the cMP can only power a single 8pin card, or 2x6pin card.

Some 7950 are 2x6pin, that will fit the cMP.
Thanks! I guess the card could be run with 1 75W power feed. Is there an adapter that will convert an 8pin connector to a 6pin?
 
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