You'll need to call thermaltake as they made 2 versions of that PSU, one has a single rail and will run that gpu fine. unfortunately they did not change the model number or the specs on the box when they made the change to a single rail.
Here's a photo of the label on the PSU itself.
I think that it has 2 12v values means it is not 1 rail? So if it has 2 rails it's not going to be fine? Thanks for helping.