Question / Help how to tell if your getting solid fps

So right now i stream in 720p 60 or 30 fps. my specs r
i5 3570 3.8 turbo boost
p8z77-v lk motherboard
evga gtx 660ti
8 gigs ram 1600 mhz

how do i tell if im gettings a solid 30 or 60 fps. wheni tab out it goes down to like 45 then bac up to 60 and stays there. waht do i do?
 
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