With those specs you should be able to run it fine with those games, WoW.. not 100% sure on performance but doesnt hurt to try.
The quality of the stream will depend on your upload speeds so you can check out
www.speedtest.net to see your max upload speed. Example of this, I have 45Mb/s down, 6Mb/s up. If I'm going to stream I dont want it to get closed to 6000 bitrate or else I'll start lagging from bandwidth cap.
Twitch doesn't really advised going above 3500 bitrate for non-partnered/100 concurrent viewers mainly because it goes off source so a little more light on viewers and mobile viewers as well. With twitch-partnered it doesnt matter as much since they have Mobile, Low, Medium, High, Source etc...
Start off with encoding I would probably try x264, you can probably do QuickSync as well (i've been experimenting on it as well) but as far as quality goes x264 will be better but also uses more CPU. Depending on bitrate again, start off with 2000 the 2500 ish.
Video settings you can try your native display first being: 1440x900(native) or down scale to 1280x800.
Under advanced keep x264 CPU Preset to very fast, the slower the better quality/lower bandwidth requirement but at the same time more CPU useage.
Settings you can try:
1440x900 @30fps (good enough for league/hearth)
1440x900 @60fps (if you play a game with a lot of movement)
1280x800 @30fps (good enough for league/hearth)
1280x800 @60fps (if you play a game with a lot of movement)
The bitrate to try is 2000, 2500, 3000ish. I know the minimum for
[email protected]/45fps is going to be around 3000-3500 bitrate. So its a lot of testing to be done, but after a while it should be easy.
I'm not 100% sure if mac OBS still doesn't have features like preview or whatnot like Windows version but you can test on a test channel and such.
