What is the code of your CPU?
I've seen one XP1600 AGOIA going to 166 MHz with no problems. However with the XP1800 you will need LOTS ok good luck, voltage and good cooling (at least not the HSF coming with the CPU) such as volcano 9 or 7+
Just post a message if you have an AGOIA CPU!
<b>(<font color=yellow>as good as it looks</font color=yellow>)</b>