Hey!
The i7 4510U is likely equivalent to a i5-4000M. The "U" designation implies that the processor is made to be battery efficient so it trades performance for more battery life.
However, it's still a good processor and it won't bottle the 850M much. The i7-4700HQ is preferred, but the i7-4000 "U" series can handle gaming, as well.
Just some additional info!
