okay i give up, but i still see no sagging but rather a sloppy installation that lead to a unnatural diagonal positioning of the graphic card ....
i've never seen a card with a sagging looking like that, strongly because it's does not look remotely like that on these i saw since the PCIeX connector give some rigidity to the card up to center and the sagging affect mostly the "free" part which is center till end right (seen on the previously mentioned 8800 Ultra with a Prolimatech MK-26) oh well it's OP's fault ... for not taking pictures right
otherwise my GTX 980 Poseidon would have suffered the same syndrome, which it did not, and it was quite heavier ... (not ~160gr more like the ratio from my 1070 to his 970 ) same goes for the GTX 580 Matrix Platinum obviously (tho that one might had a better build quality ...
)
USB connection (probably front panel) .... tho i write that because i did read that as explanation ... i tried to manage that with one soundcard (and i have 2 USB2.0 connector under it ...) and still not got a slight bend ...
not ignorance .... different opinion and issues .... until the OP is back with an answer (which will not happen) we can't tell which one is really right .... after all the picture make it all foggy .... you see something i see something else .... who's right? (nope without explicit proof and answer from the OP you can't tell "i am 100% sure" )
i will retract my point of view once the OP will clarify the situation.....
as my initial sample show, usually sagging goes slightly middle of the card to the extreme right, while the extreme left usually stay straight or bend in the opposite way
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but it seems none of them can take a good aligned picture
let's hope the OP's X16 slot is not looking like that ....
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