enough is enough ... i get it you didn't read the 3 previous post entirely
no need to go further, the OP just need to buy a GPU jig and he should have done it right at the start.
i already recognised i was wrong ... no need for further explanation ... i wrote the post dynamically .... didn't bother to edit what was already done ... not worth it
tho the back of the card (right) is not relatively straight and clearly dropping down (as seen on many example of sagging) the PCIeX slot give some rigidity and the weight center is comprised in it, the pictures are not correctly taken, ok but the rig looks also sloppy (albeit being induced by some specificity that the OP's hardware has .... )
seriously a 4th page to that thread was unneeded.
edit: oh wow actually a jig placed at the extreme right, as many recommend to do, would only shape the PCB in a U...
better one of the long type that use a case slot and bracket than these makeshift pilar
btw a sorry excuse for a backplate is better than no backplate .... wait probably not, mine does not have a backplate and show no sag at all, damn that 970 Strix is really a P.O.S in term of build quality
i get it the OP wanted to point out the problem to the community (altho not really needed ) and already knew the solution to the problem ... still THAT card HSF, is not too heavy .... the title is what made me draw other assumption after seeing how bad the rig was in the pictures ....
he could have titled that "Asus GTX970 Strix, sagging issue" since it's a already known problem and not related to a "too heavy" issue. (tho it would have been picked up by some other forum-er than me that the issue could've been something else judging by the rig general outlook)
just use chopstick, heavy cooler tend to give sagging effect. solid backplate could reduce it but not much
that card is not heavy, it's the build quality that is sh!t ... a little above 1kg and sagging? then i wonder how 1.8kg managed to hold 1 yrs and a half without any sag. (ok the backplate was actually almost 3 time thicker, just like the front plate on my Armor that only weight ~800gr )
tho the solution is right (and the OP knows it since the start of the thread)