200 MHz is the FSB frequency. 800 MHz is the FSB clock. As nnorton said, "200 MHz quad-pumped bus (200x4=800Mhz)". That means each bus cycle transfers 4 chunks of data. Each transfer requires a clock pulse. So each bus cyle generates 4 clocks.
Confusion abounds because people tend to use the two terms interchangably. So you need to figure out exactly what they are talking about by context (how the phrase is used at that time).