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It's even worse: 200/266/333/400 is *not* the FSB (front-side-bus), but is 2 * FSB, because it's "double-data-rate" memory. DDR200 runs at 100 Mhz, DDR266 at 133, 333 at 166 and 400 at 200.
That's similar to the supposed 800 Mhz FSB of the new Intel P4's with Hyperthreading: that's actually 4 * 200 Mhz FSB...
The PC2100/PC2700/PC3200 shows you the maximum "speed" of the memory in MB/s. DDR400 (2*200 Mhz) has a (theoretical) throughput-speed of 3200 MB/s.
And to further confuse you: those new HT P4's (and Athlon Nforce2 motherboards) support "Dual-channel memory", which lets two DDR400 chips work together to act as a single chip with a throughput speed of (theoretically) 2*3200 = 6400 MB/s...
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