In the meantime, I downloaded CPU-Z. I don't want to turn the system off just to go into the BIOS for a few seconds...and I needed to familiarize myself with this tool.
I'm currently on a system running an AMD Athlon XP 2200 processor.
My Core Speed is reflected as 1800MHz, which matches my 1.8GHz reflected when I do the Start/Properties thing and look at the summary data.
My clock multiplier is listed as 13.5, which means that 13.5 multiplies my bus speed (133.3) to give me my 1800mHz/1.8GHz speed.
See how that works out for you...given the CPU-Z numbers.
Using CPU-Z again, I see DRAM Frequency of 166.7 and FSB:DRAM of FSB plus 33MHz (200MHz), with a CAS of 2.5. I have two modules (2GB) of PC3200 installed.
I have not tweaked this system in any way.