Hey guys,

I just spent about an hour searching these forums and testing various fixes, but I haven't been able to solve this. Per Precision X and Afterburner, my top GPU is topping out at 899 MHz, while the lower card reaches maximum boost (including OC profiles). The cards are linked, and I confirmed this only happens with FO4 (tested with Bioshock Infinite and Firestrike Ultra - both cards ran together at 99% utilization and 1405 MHz). I play in 1920x1080 Windowed mode, but this does happen when I force the game to run on full screen too. My FPS drops are just terrible - walking into Diamond City can drop me blow 30 FPS - so I'm open to any and all suggestions here.

Thanks!

Edit:

4670k

2x Asus 970 (SLI)

8GB Corsair Vengeance Ram @ 1866 MHz

Corsair HX850

Samsung 840 EVO (500 GB)

Asus Maximus Hero

Have u tried https://m.reddit.com/r/fo4/comments/3s5ldy/how_to_get_sli_working_in_fallout_4/

What happens when you remove Precision X?

Make sure Max performance is set in the driver. What happens when you disable vsync?