AMD XP 2000+ Problem

[BackStabber6]

The computer I just built includes an AMD XP 2000. For some reason, I cannot set the FSB to any higher than 100. Because I set it on 100, the computer detects my cpu as an AMD MP 1.2. Several attempts to change the FSB to 133 have resulted in crashes so quick I have barely enough time to go into the Bios and underclock the FSB back to 100. Any ideas? My comp includes:
ASUS A7N8X Nforce2
AMDXP2000
512 MB DDR 2700
Gforce4 ti4200

Thanks.

 

[Nights_L]

Power supply?

 

[Mithrandir2582]

I have the same exact problem witht the same mobo.

 

[slvr_phoenix]

Heat sink? Thermal interface material used between processor and heat sink? Size of the case? Additional case fans?

<font color=blue><pre>If you don't give me accurate and complete system specs
then I can't give you an accurate and complete answer.</pre><p></font color=blue>