In order for the memory actually runs at 200Mhz (effective in 1600, ie PC3-12800) you either need to define themselves as or set to XMP, whereupon the latches are clocked at the optimum values towards this in the BIOS.
The Asrock Z77 Rxtreme4 the option called 'XMP Version 1.2' (Bios v2.00) - can not Possibly each Bios / or only with Ivy Bridge CPU?
According to c't brings Ram 1600s compared to normal modules (1333), in practice, not really something, but at the price :)