not sure, but I am running my 930 like that at 185x22.0 with turbo boost set to Auto. Here is a screen shot. With 960 and x58a-ud3r I did at 160x25
The bus ratio listed by Intel is 21x for the 930 and here is my cpuz validation:
CPU-Z Validator 3.1
you just need a bit better board I would imagine, or a board that has turbo boost settings, of enable, disbale and auto