Hi, Some AMD processors are designated with numbers like 1400+ etc. They do not clock at 1.4 Gigs but the 1400+ clocks at around 900 MHZ. AMD's claim is that they process as fast as an Intel 1.4 Gig due to more efficient coding. There is not an exact formula. The easiest way to find out is to go to the maker's site or a Vendor's site and look up the model you are interested in. Some vendors list the actual Clock Speed.
Good Luck, Jim