Well what can you afford? Obviously SLI 680's are going to be the better setup vs the SLI 670's. But I think that the better value lies with the 670 SLI setup, I don't think the extra $200+ spent for the 2 680's will be worth the performance gains you will receive.
Only gaming at 1080 you only need one high end card prob a 670 will suit you. If you plan to move up the ladder to 2560 x 1600 or 3 displays then def go with 2 680s in SLI. I love my 2 x 4Gb 680s. Crysis 3 and BF3 at my res are the chit!
Ok but i am worried that i wont get over 60 fps consistently with only one. I have another monitor that i could use....would that be worth the upgrade to sli for double monitors?
Ok but i am worried that i wont get over 60 fps consistently with only one. I have another monitor that i could use....would that be worth the upgrade to sli for double monitors?
You won't get 60 fps consistently.
As an example, I've got an i7 3770k running at 4.5 gigs, and a Gigabyte GTX 670. In Far Cry 3 with all settings cranked at 1080p, I get around 50-55 fps. The 670 is overclocked to the point where it is comparable to a 680.
If you intend on playing Far Cry 3 or Crysis 3 at 60 fps, 1080p, and settings cranked, you're probably best off getting twin 670s if you intend on sticking with Nvidia.