Right on the limit as you know, so step with care when you update drivers and you loose the under clock on the gpu and run something that may take it past what the psu is happy with. Also a hard system lock for any reason may send everything to full power use and take out your psu and other components. Honestly not worth the risk being that close but as long as you understand that and if the GPU has a quiet bios switch maybe worth switching to that if it is set to performance as another way to make sure it doesn't use more power by accident.
Also furmark is recognised as a power virus by the Nvidia drivers
so will never fully stress a gpu now and max out its power use in a none safe manner, that's why I asked you to test with it and cinebench because was a pretty safe test and chances are it would have just gracefully shut down. Just remember some software can push the gpu to silly power use and the nvidia drivers don't recognise it as a power virus.
Not dramatic when it comes to peoples safety
was making sure you understood the risks if the worst happened and I'm sure you know it has happened and even these very forums have many examples of pcs catching fire.