Game looks incredible and runs well too. I almost managed to get away with running it single card, but it slows down in some scenes so I had to use SLI. The grass setting on Ultra destroys your performance if you're in one of the fields outside of the city that are full of vegetation. Even with SLI on it still gives me noticeable frame drops to the high 30s.
It also uses all 8 cores of my CPU as well. Rockstar's Toronto office did an amazing job on this port. I should go down there and give them a high five. This game looks a lot better than Watch Dogs does and performs much better as well for another open world game. The view distances are the best I have seen in any game.
It uses about 4.5GB of VRAM according to Afterburner at 2560x1600 with everything turned up/on except for TXAA, but the game claims it will use less in the options.
Avoid TXAA, really bad in this title, blurs the entire screen heavily.
Yeah TXAA is disgusting, had to turn that off after I realized the game looked blurry. I'll have to remember to turn on Precision X's OSD to measure VRAM while in game. BTW anyone know where the benchmark results go? Whenever I run it, at the end it just asks me to quit the game.
Edit: Found it, my documents folder. Here's what I get w/the settings I posted a few replies up. This is w/my 24/7 settings of the Titan's at 1.4 GHz. I noticed that after a certain point, the GPU's get bottlenecked by the CPU and it doesn't matter if I bump up the GPU clocks as FPS doesn't really go up much:
Frames Per Second (Higher is better) Min, Max, Avg
Pass 0, 49.091476, 96.878372, 79.289520
Pass 1, 21.606398, 147.072784, 51.193653
Pass 2, 33.830849, 146.311584, 69.318916
Pass 3, 32.435146, 195.170731, 86.105736
Pass 4, 19.214289, 166.838837, 69.332642
Time in milliseconds(ms). (Lower is better). Min, Max, Avg
Pass 0, 10.322222, 20.370134, 12.612007
Pass 1, 6.799355, 46.282589, 19.533672
Pass 2, 6.834729, 29.558821, 14.426077
Pass 3, 5.123719, 30.830753, 11.613628
Pass 4, 5.993808, 52.044601, 14.423221
VRAM use (with TXAA enabled for consistency):