Nice setup but overkill for 1080p 95% of the time.
At 1080p you will very very rarely use more then 2GB RAM.
Your good to go for 1440p/1600p gaming though.
I know it seems like overkill but I actually saw stuttering in Mass Effect and Mass Effect 3 with all the detail settings at maximum with my 2GB cards. It was something I'd never noticed on my 23-inch Samsung monitors so I deduced it to be the GTX 670s I was running in my boxes. I can also state that gaming just seems...smoother with the additional RAM; again it could just be my imagination but I don't think so.