4 gig or 8 gig video card

[jjhiller]

Will more vram be better for gpu encoding

 

[vapour]

Get 8 GB if you can afford, GPU encoding does use GDDR5 ram inside GPU.

 

[geofelt]

More is better.
But, amd and nvidia use vram differently so comparing specs is probably not a good selection criteria.
Best to look at the recommended requirements for your encoding app for guidance.