2gb for GPU Ram when even a launch title in the form of Killzone Shadowfall is already using 3.5gb as VRAM is... troubling moving forward, to say the least.
Buying any card short of 4gb right now seems like suicide for the very near future. Waiting for 6gb on a non ridiculously priced card personally to air on the side of caution considering how RAGE needed 512mb of GPU ram to even start up despite only needing 256mb on console.