Dual CF HD 5870's > Twin SLI GTX 670's.

Is this a good, solid upgrade? Will I see a significant improvement in performance in games like Battlefield 3, Crysis, Crysis 2, Skyrim, Metro 2033, and so forth?..

The 1GB of my HD 5870's is causing low fps and microstuttering in many situations. I have a 1920x1080 resolution monitor, and 2GB+ on your GPU(s) comes in handy.