http://www.behardware.com/articles/876-1/review-nvidia-geforce-gtx-660-asus-directcu-ii-top-and-sli.html
Wow, the 660 scales quite incredibly
I think I will definitely pick up a second one when money allows it!
http://www.guru3d.com/articles_pages/msi_geforce_gtx_660_twinfrozr_iii_review,25.html
I had looked at this before asking the question, I can't find any testing at 1080p. Granted, 1920x1200 is super, super close, but it's just 'not the same' in my eyes as the viewer of the results.
TYVM for that first link!