New ALEXA EV firmware v. 2.1:

1080p ProRes 4:4:4 12 bit - Now up to 40 fps.
1080p ProRes 4:2:2 10 bit - Now up to 60 fps.

Both options uses the on-board SXS cards.
Maximum framerate can vary depending on the sustained speed of the specific SXS card used.

Go to the ALEXA EV page