Yes, Arria® II GX/GZ VCCH_GXB pins are able to support 1.4V supply source, beside 1.5V. Please, refer to Arria II Device Family Pin Connection Guidelines (PDF) for additional details.
Device Family: Arria® II, Arria® II GX
Area: Component, HSIO
Last Modified: January 01, 2015
Version Found: v2.2 Service Pack 2
Bug ID: 0