XPS 8930, Compatible RAM, #5

I took a look at the model number of the ram in my computer and it's a Samsung m378a1k43DB2-CTD rather than Samsung m378a1k43CB2-CTD. Do you know what the difference between the "DB2-CTD" and "CB2-CTD" is?

Will there be any performance issues if I mix the "DB2" and "CB2"?

Thanks!