I have a W530 and just last week got the Asus PB287Q monitor ($649). 4K is REALLY nice. The display was only being driven at 30Hz. So SystemUpdate said there was a new driver for the K1000K chipset. I loaded that and got 60Hz - but max resolution is FHD (1920x1080). Sooo, I did a roll-back of the driver. Now it won't go into 4K resolution and only at 30Hz.
Old driver: 10/31/2013 .. 9.18.13.1270
New driver: 4/8/2014 .. 9.18.13.3302
NVIDIA Control Panel version: 7.5.800.0
Any ideas? Anyone know of a better driver to use?