The card has OCP/OVP at 1.4v. I am able to bench at 1605mhz/2010 mems with 1.4 Vcore though so its looking good for 1.55 which is usually what you need to max out these cards. A new Bios is defo needed for the card for XOC and I have requested one from EVGA. I ran in window mode to check boost under full load with GPU-Z sensors tab and its 1605mhz.
Here is 3D 11 result at 1605/2010 with air cooled 5ghz Haswell. This is version 1.05 of teh bench which I have installed on this test rig at home. At work I have 1.01.