amd's website has some in depth tech specs on their processors. after about 10 min, i found that the "Maximum die temperature" for an XP is 90 C. this probably means that is will melt at that point. i run a p4 1.6a overclocked to 2.1 with water cooling. my temps top out around 45 C.
heres some links for you regarding amd tech specs.
http://www.amd.com/us-en/assets/cont...ling_guide.pdf
AMD Athlon™ System Cooling Guidelines
http://www.amd.com/us-en/Processors/...9_3748,00.html
AMD Athlon™ XP Processor Tech Docs