I'm running on a Gigabyte GTX 770 2GB (slight OC since it is the Gigabyte version), i5-4570 3.20GHz and 8GB Ram in 1080p.
I am using the following settings with about 45-60 FPS. The FPS mostly go down to 45 in villages and places with many people.
- Hairworks: Off
- Number of background Characters: Low
- Shadow Quality: Medium
- Terrain Quality: High
- Water Quality: High (havn't been to the sea yet to try out the performance impact)
- Grass Density: Medium
- Texture Quality: High
- Foliage Visibility Range: Low
- Detail Level: High
The Post Processing Effects are in a seperate menu and except for AA and AO take up basicly no performance impact. So you can take what oyu want.
I am using SSAO and AA.
Hope that helps