2012 iMac Bootcamp League Performance

LoL isn't a particularly GPU intensive game, and a playable 1080p on a 650M is likely possible, but I don't know if you'll maintain a steady 60FPS during busy scenes.

You're unlikely to get a lot of "first hand" answers given that most gamers on this forum aim for 27" models, but some investigation on http://www.anandtech.com/show/7399/...review-iris-pro-driving-an-accurate-display/3 (look at the benches for the 650M; ignore the rest of the review) and http://arstechnica.com/apple/2012/1...imac-takes-two-steps-forward-one-step-back/3/ shows that a 650M can do 60FPS in a few games, but once you start pushing towards 1920x1080 it just runs out of bandwidth.

I don't have an iMac but this should give you an idea for graphics performance. I play LoL on my 2013 11" MacBook Air connected to a 1920x1200 display (more pixels than a 1080P display!!!) in clamshell mode. It's got Intel HD 5000 integrated graphics with 1024MB (1GB) of VRAM. In LoL, I set every graphics setting on high except for shadows which is medium. I get 40-50 fps at 1920x1200 resolution. And this is coming from integrated graphics. I'm sure you can get a constant 60 fps (maybe rare dips below that) with everything set on high with the 2012 iMacs.

Oh and I use the Mac client. It's gotten a lot better in the past few months in terms of performance. I used to get 30-40 fps about a month ago. Then came a client update (I forget which one) in the last few weeks and now I get 40-50 no problem.

for now i still have the 21.5" imac with 650M and i play LOL on MACOS and i get 60FPS but in combats and when you select spells that has AOE effect the FPS drops to 30FPS. But im sure in bootcamp you will get 50-60fps all the time.

My settings are high with shadows low at 1080p

i still waiting for my 27" 780M, probably next week i will tell you even with that dGPU how it performs