Yes I have the exact same problem, I've used every Nvidia driver since the original 4kx2 driver release. 1920x1080 becomes a small box for me, same with 2560x1440. It's not scaling correctly. I've tried switching aspect ratios via the monitors OSD as well as trying to stretch it via Nvidia control panel will not let me extend it beyond default. Funny, my Monitor actually came with a DP 1.1 cable I had to buy a DP1.2a cable off of Amazon. I'm running display port to display port. I'm using a GTX 780 Reference card from EVGA.
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