You are looking at a beta driver. Anyways, I downloaded an OpenGL extension viewer, with a GTX 1070. It tells me that I support version 4.4 with the latest drivers. When looking at the details, it shows I support verison 4.5 (10/11). Meaning that a GTX 1070 supports all but one OpenGL 4.5 feature.
A GTX 770 is an older card, and isn't likely going to support as much as a GTX 1070 does. Meaning you'll only be 100% compliant with version 4.4.