GeForce GTX 780i 3gb or GeForce GTX 780 6gb, Which one is better for GPU rendering?

#1

GeForce GTX 780i 3gb vs GeForce GTX 780 6gb, has anyone tested these cards, which one would be better for GPU rendering in Vray RT, iRay & Octane?

#2

Regardless of the small speed difference, i’d pick the 6gig card as memory on these will be your biggest problem.