here is more info on the 29 inch from the French LG site although most of the descriptions are in English.
http://www.lg.com/be_fr/moniteurs/lg-29UM95-ips-monitor
- The 3440X1440 UltraWide QHD display offers the sharpest picture quality. Its pixel area is about 1.8 times larger than an UltraWide Full HD 21:9 monitor, and about 2.4 times larger than a Full HD 16:9 monitor. It provides an efficient environment in using Microsoft Office programs showing 47 columns and 63 rows in excel.
* 21:9 Screen or 3440 x 1440 (60Hz) resolution may not be available depending on content, device, interface or graphic card.
- Thunderbolt 2 is a revolutionary cable technology that simultaneously supports high-resolution displays and high-performance data devices through a single, compact port. Users can now take advantage of transfer speeds up to 20Gbps and easily expand computing capability by connecting up to six devices via a simple daisy-chain configuration.
* A daisy-chain configuration may not be available depending on PC performance, interface or graphic card.
I can't find any specifications on dimensions, but based off other LG IPS 29 inch monitors, this one should come in about 27 inches wide