The GeForce GT 610 is just a rebranded GeForce GT 520 with circuit board and cooler updates. In some cases the hardware is exactly the same but only the firmware has been updated. The performance of the GeForce GT 610 and the GeForce GT 520 is exactly the same.
The GeForce GT 610 performs a lot better than the Radeon HD 5450 (i.e. the Radeon HD 5450 has only 66% of the GeForce GT 610's performance).