I own this card and when it sits in the case, it hangs downward on its right side. The card seem to be poorly designed in that it doesn't sit vertically in the PCI slot, the chassis is too heavy and cause a tilt on one side. Does anyone else have this issue?
More about :question gainward geforce gtx 660 phantom
this pcb sag is pretty common and it is not really something to worry about. on the other hand i have a very long tahiti le (it is 0.2" smaller in length than a 660ti) i have just used the power cables to help keep everything inline, not so that it binds the power cables but so that the power cables are not actually pulling down on the card.
others will use something connected to there hdd area to come over and support the card and still others if you have a way to connect will hang a ziptie or something from the top of your case.