And AMD just released the 14.6 Radeon beta driver for improved Watch Dogs performance
Will you test with that one too, to see if it really helps?
I will certainly check it out, looking at the Nvidia driver right now.
The driver isn't available yet but I will jump on it once AMD release it.
UPDATE: Just checked the 337.88 WHQL drivers and the performance with the GTX 780 was exactly the same as the 337.50 BETA drivers. I was under the impression that they were the same driver, version 337.88 was just certified. Anyway performance in Watch Dogs goes unchanged.
Given the performance that we saw from AMD and Nvidia I don't think either has much room for improvement. Multi-GPU performance is another matter but I don't see single card configs getting much faster. That said I am keen to check the AMD driver as they have had less time than Nvidia to prepare their drivers for this title.