There are very minor differences between the Erazor X and X² driver interface (click here to check out the driver interface). The overclocking option has mysteriously disappeared with this driver and there is an added property window for the video out options that you can see below.
The added video control can be pretty handy especially for those of you who have televisions that don't seem to center with the video out. Flicker, brightness and saturation controls come in handy sometimes as well.
Overall the driver interface is just as functional as the Erazor X with the exception of the overclock window being gone. You'll have to use Powerstrip until ELSA puts the overclock utility back in.