Ok here's the setup so far, I'm kinda disappointed.

8RDA+ 1.1 A1 (Vantec on NB, NB stock on SB, NO VDD Mod)
XP2100+ Tbred B JUIHB (I think, can't remember)
2x 512mb Kingston HyperX PC 3500 (In dimms 1 & 3)
Gainward ti4200 128mb

So far, the best I can do is 13*166 stable. This is 1.775 Vcore and 2.77 Vdimm.

I've taken off the FSB jumper (as suggested in some other threads).

Tried 13*180, Get to XP but errors
Tried 11.5*195, same result.
Upped Vcore to 1.825, same, BSOD's @ XP

Suggestions?