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The extra 2 pins on an 8-pin are just ground sense pins, and most power supplies route them to combine with the normal grounds anyway making no electrical difference from a 6-pin. I'm going to use a six-to-eight-pin adapter as a permanent thing with my GTX 280, personally, alongside one normal six-pin connector for the six-pin molex.
Seasonic sent two for free (they even paid for shipping) - All I had to do was email them. I recieved the 6pin+2pins from them for my 600w Seasonic M12.
Yup, both the 9800GX2 and GTX 280s should come with adapters.
Yup, both the 9800GX2 and GTX 280s should come with adapters.
Last I heard there was no 6 pin to 8 pin adapter with EVGA's 9800GX2 (though I think most others do include it).
Those adapters in the picture are 8 pin to 6 pin (8 pin from PSU to 6 pin to graphics card) and the 8 pin to 8 pin adapter (because the clip is in an odd place on some 8 pin connectors, so this adapter fixes that). But the much needed 6 pin to 8 pin adapter (from power supply to card) wasn't included.
EVGA 9800GX2 owners made such a stink about it, that EVGA decided to include them with the GTX 280. However they put a huge ominous warning in with the adapter stating it's for temporary use only and the world will end if you use it too long.