06-18-2011, 06:05 PM
I've been a bit curious about this too. The problem with SC 2 benchmarks is that everyone has their own replay file. The use of a replay file may skew the bench results anyway, simply due to the fact that the CPU isn't having to actually calculate pathing and such.
That said, I ran some tests at native res on a 27" 2011 6770m (2560x1440) with 12GB of RAM. I did shut down any misc programs running, but I didn't go so far as to shut down any 'extra' stuff I have that always runs, like bonjour or plex media manager.
With extreme and ultra settings on a replay at 2x speed, which gave an FPS of 18-21. It didn't seem to make a lot of different how much was going on on the screen, and there was no discerenable difference between ultra and extreme.
At High settings native res, it was slightly faster. I was running between 19 and 22 fps.
At Medium suddenly the FPS stayed at 29 most of the time, with a range of 27-31. This was perfectly smooth gameplay imo.
None of these are really 'unplayable' for an RTS type game, but I think the medium / native 2580x1440 res or dropping down to 1920x1080 at the ultra settings yields the best gameplay on this particular iMac. To be honest, I cannot see much difference between 1920x1080 and 2580x1440 within the game. The difference is startling on the OS X desktop though.