2133Mhz (O.C)

So i bought 2x4gb Adata 2133mhz but my motherboard can only run 2000mhz will the Ram be clocked DOWN or will it over clock my system?

You'll have to go into BIOS and put the XMP file if it has one or set it manually. Not sure if you'll be able to get the 2133 tho.