Hello
I think the game has some problems using SLi on 680ies.
I got the newest geforce driver installed f4 on SSD and played.
High settings OK sli doesnt work weak performance round 30-40fps, second card 0-10%.
Ok so i moved to enabled afr2 in nvidiasystem.
Cool wow it worked Very good, SLI active, 60fps no stuttering nice this should it be ... I thougt ... Nope sad story: the game crashes after 10-15minutes to desktop and nvidia driver failure in windows. So i thought it could be something with energymodes or\and underclocking: evga kboost hello!
Enabled kboost, enabled afr2
Nice that worked but only 45-60minutes after that freezed and crashed again!
Damn!
Next step
Nvidiainspector fallout4 profile enabled
Nothing changed
damn you ... Nevermind.
Tmeperature is fine also.
GPU usage is both about 80-100% seems good!
But i mentioned this comes everytime iam outdoors and Very Very often if i use crafting or changing things in pipboy and then going back first Person ingame.
So Bethesda i think its your turn.

Specs:
i5 2500k @ 4ghz
Gainward 2x680phantom stock
8gig RAM
Newest geforce driver
Also tested f4 with beta drivers

Any ideas @ Community?

Have you tried removing 2nd card? As SLI is not supported, though it works for some, I would start with just one card and go from there. Let us know.

Yes AS i said SLI only works with afr2 on.
In stock driver settings it doesnt work thats right. But i wont believe this is bethesdas company philiosphy...
With only one GTX 680 its in my opinion not playable (~30fps).
Why cant Bethesda patch this for optimization on sli systems ...

"Oh, ahm no we cant, but you can buy a better graphics card like 970 for about 300 bucks"

No not dealing with this Kind of politics.

If this works with afr2 so well why cant this be done by patching so that you can play for 6-8 hours instant play and not only for 60minutes (demo mode lol)

60bucks per game and this cant be done hmpf i dont think so ...

I have two gtx 670's and have tried the fallout 3 sli bits in nvidia inspector and it crashed at the main menu. Next I tried out skyrims bits and it fared much better but ultimately crashed after 10 minutes or so. The conclusion is we have to wait for nvidia to finish the drivers that have sli bit for fallout 4 in them, so that will be around next week or the week after at a guess.

I fully agree on the SLI issue. If you are going to make a game or any product that will be expected to take advantage of SLI/XFire, it should be ready at launch. The idea is the percentage of SLI users is so small compared to the entire community that you get left to wait. Focus will always be on the largest customer base first as they bring in the bulk of the money. Coming from the software and support world myself, I've experienced this first hand trying to get features into products for customers. The first thought is how much money have they spent or will they in the future?