I too have noticed a spike in my GPU temperature only when I'm playing FFXIV. It gets ridiculously hot to the touch. I have a small desk fan pointed right at my video card as a temporary solution. I checked to make sure my fans are running properly and have cleaned out my PC too, despite it not having been that dirty and dusty to begin with. The temperature spike used to never happen before and it doesn't happen when I play or do anything else, so... I dunno lol