I don't know.... Streaming is VERY CPU dependent... my friend with a Q6600 couldn't stream sc2/lol/dota that well but after he switched to a i7-920, he can stream everything fine...
I guess it depends on the resolution of the stream the op is doing. if he's trying to do 1080p streaming, there's no chance in hell he can do it. but if he does 640x480, it might be fine.