Can I use two additional Apple Thunderbolt Displays at 60 Hz with my MacBook Pro Mid 2014? Which is the maximal refreshment rate for two connected Thunderbolt Displays? I want to connect them via Mini-Display-Port to the Thunderbolt Ports of my MacBook Pro 15" Mid 2014. I want to use the maximum resolution (2560 px) on both TB Displays. Is it possible to run them both at 60 Hz and max. resolution?
According to Everymac


  This model supports a simultaneous maximum resolution up to 2560x1600 on two external displays via Thunderbolt. Alternately, it can support a single display up to 2560x1600 via Thunderbolt and a single 1080p display at up to 60 Hz, 3840x2160 at 30 Hz, or 4096x2160 at 24 Hz via HDMI.


…so I'd say 'yes'.