So Ive finally gotten all the components but it seems that Id not given any thought to power supply cables; my old 2008 Mac Pro had a GTX 680 in it, which used the exact same cables as my previous Radeon HD 5870 (2x 6 pin), but the GTX 780 Ti (and I understand, the ordinary GTX 780 too) has 1x 8 pin and 1x 6 pin. The card itself came with a Y-adapter to convert 2x 6 pin into one 8 pin connector, but whilst I could connect it with this Id be left short by 1x 6 pin. I think Ive got another 6 pin adapter spare (connected to the 8800 GT Ive put back into my 2008 model) but Ive no idea where else I can connect it. Looking around Ive read about people jerry-rigging their own adapter to feed from the optical drives, but Im still intending to use at least one of these. How have other people with a GTX 780 connected their card in their own 2010 Mac Pro? Id really appreciate some advice here!