If you can successfully unlock your chip, your board will probably support 200FSB, as it's an nforce2 board.
The only reason I say <i>probably</i> is because the earlier versions of that board (as with many nforce2 boards) were based on the earlier version of the nforce2 chipset which didn't have <i>official</i> support for 200FSB. The good news is that most would either do it anyway, or get very close. For example, my Epox 8RDA+ would only do 196FSB without modification.
So basically, even if your board doesn't support 200 exactly, it should get near enough to make the mod a worthwhile one!
That said, 12.5x200 is pretty unlikely without some excellent cooling and high voltage. You really need a 'true' mobile for that sort of overclock. You should be able to get somewhere between 2.1 - 2.3Ghz though. Just make sure you use a decent cooler.
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Epox 8RDA+ V1.1 w/ Custom NB HS
XP1700+ @200x10 (~2Ghz), 1.4 Vcore
2x256Mb Corsair PC3200LL/1x512Mb Corsair XMS PC4000 2.5-3-3-7
Sapphire 9800Pro (VGA Silencer Rev3) @418/742