This should probably be in the XP forum, I mix the two up sometimes when I'm not careful enough. No worries, someone will probably move it there if it matters.
I think it's a 166MHz FSB CPU. The multiplier on those is 12.5, but the multiplier on the FSB133s is 16. 12.5x133 (it's probably an FSB drop) is 2000+ standard speed, 16x100 is likely to be read as a 1900+.
Okay, first, you're going to need to either get some PC2700 DDR memory or set the memory speed to 133MHz in the BIOS. You can do the latter by entering Expert/Manual/whatever for all the options in the "Advanced Chipset" section of the BIOS (I think that's it) for all the options, then setting the RAM's speed to 133MHz, or "80%". (Make sure the bus speed / FSB is set at 166MHz!
If this is confusing (and it really can be, the options in the BIOS are quite confusing), repost and I'll post in more detail.
To overclock, you will probably want a good CPU cooler and good system cooling. A couple cheap Speeze or SUNON 80mm case fans should do okay for case cooling. Look for fans that put out at least around 35CFM. If you feel like spending an extra couple of bucks, Panaflo High Outputs would do the job very nicely. For CPU cooling, something like a Thermalright SLK-900A or SLK-800A would be good. (You should use a 92mm fan on the 900A, and an 80mm fan on the 800A. Again, Panaflo if you feel like it.) Make sure you use good thermal goo (Arctic Silver Ceramique, Nanotherm PCM+, and Shin-Etsu G-751 are all good options) and spread it thinly. Again, if you need more detail, tell me and I'll try to provide it.
DEC Pentium X2 5200+ w/ HyperCache (Ezra core)
Asus M7NCD-MAX3 (OPTi Vendetta 82C760)
6x Generic 32MB PC2700 RDRAM (50ns SIMMs)
2x nVidia Millennium X1800 Duo (SLI mode)
12x (daisy-chained) Quantum Medalist 180GXP (w/ separate SCSI-1 adapter)
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