Surprised I haven't seen this posted yet (searched and didn't see). For some reason TweakTown decided to only test at 1920x1200 which makes zero sense for a 4GB card, but at the very least we know these cards cannot be far off retail yet. Poorly written as well, but worth a quick look.
GTX 680 4GB: http://www.tweaktown.com/reviews/46...orce_gtx_680_4gb_video_card_review/index.html
GTX 680 4GB SLI: http://www.tweaktown.com/articles/4...rce_gtx_680_4gb_video_cards_in_sli/index.html
GTX 680 4GB: http://www.tweaktown.com/reviews/46...orce_gtx_680_4gb_video_card_review/index.html
GTX 680 4GB SLI: http://www.tweaktown.com/articles/4...rce_gtx_680_4gb_video_cards_in_sli/index.html