By killing explorer.exe I get 30 FPS in the observatory, 35 some places. Setting down resolution doesn't gain me anything but AA slows games down 15-20 FPS (it's broken kinda, since it didn't slow them down a while back). Anyway, if you're going to compare speed just do it by standing at the very starting point of the observatory, it can vary a lot as you move and jump.
Specs: intel i5 3570k @ 3.4GHz;
16Gb RAM; Raedon HD 7900;
Win8 64-Bit
16Gb RAM; Raedon HD 7900;
Win8 64-Bit
