I have a fair number of machines that randomly have a hot card like this. Ive always chalked it up to chip quality, its just luck of the draw.
Does it ever result in your machine crashing more often than others? Mine goes down at least once every 24 hours. I've upped the fan to 72% to see if that improves stability.
gigabyte cards are meh.
set the oc clocks lower on it.
if you are running windows 10 and use msi afterburner it is a pain in the ass to do it.
but it can be done set all cards 1 at a time
Expanding on Philip's post, I'd suggest downloading EVGA Precision or a similar GPU customization tool, and reduce the GPU and Memory Clock offsets. You can also set a temperature specific target, which should prevent crashing and card burnouts (I've had a FTW 1070 go up in flames, so keep it on the lower end of the tolerance range).