Games beautiful but it seriously is harsh on the framerate currently.
30-48ish FPS with max settings on a gtx 580 with an i7920 OC'd to 4.2 gigz and 6 gigz ram on windows 8.
Hopefully in the coming days a patch is released to improve performance, along with New Drivers from nvidia etc.
I was using alot more bells and whistles than Total Biscuit was in his WTF is also.
The guns in this game feel amazing, even the pistols feel great. also the driving is a massive improvement over farcry 2's.
the PC version and the console versions don't even look like the same game, there are some seriously good textures here along with some of the best lighting I have ever seen.
Nvidia already released a beta driver yesterday to improve performance in Far Cry 3.
But it didn't improve it by much for me.
With a GTX 570 I was using max settings and 4xmsaa and only got around 33-42 on average and higher if in smaller areas or looking at the ground or sky.