Using the MSIKT266Pro-Ru and a locked xp1800+ how fast have u gone stable?
And could u tell us ur bios settings please ?
Cooling is not a issue Cpu-33C Case-28C (Air)
All Vantec Stealth Fans except HSFan
Well without knowing the stepping of the CPU I would say the most you can hope for is about 1750mhz, a lot of people cant make it that far. That would be about 150 FSB on the default multiplier (assuming you are going to be using 1.85V).
I have a different MoBo but I used to have the 6cu (not the +, mine was only 4500RPM) and it was stable at 150FSB but quite warm. My stepping is AGNGA "Y", if you have a newer stepping then that you might be able to take it a bit higher but 1800s arent known for their OCing abilities.