You can force it.
I only have 1GB VRAM and I just use a command to force it.
It works just fine, it's just kinda weird because it will suddenly go into slow motion, not like a framerate drop, just it turns all slow motion-y for a second. It's weird. I think it's trying to get it from my slow hard drive and is weird.
Holy stuff, that happens to me, but I don't need to force it, cause it allows me to.
Ah. Well, I remember you for some reason, lol
Holy stuff, you're beachbum?
Anyway, on topic, you'd be better to get the 2GB version if you play a lot of high res games, or want future proofing.
However, list the GPU, cause if it's low end, it may not be worth it.