My Gigabyte have been rock solids so far. (5x) The only things I would consider a 750ti without 6-pins connector. With five GPU I don't have any more 6-pins or molex connector I can safely use.

I was thinking of getting something without the 6 pins, but my X58 mobo doesn't really have any supplementary power for the PCI-X slots, would this matter at all? If running 3/4 cards?