no... if you even expose the athlon XP cpu to sunlight it will spontaneously compust!!!
*shakes head sadly*
assemble it according to instructions and use AMD certified equipment. if you are unsure, get a professional to do it for you.
<font color=purple>I am the Motherboard Destroyer! Hear Me Roar!</font color=purple> <font color=orange>*SQUEAK*</font color=orange>
Since you have specified the Asus A7V333, which has overheat protection based on the AXP internal diode, if you have heat problems the system will simply shut down.
If you assemble the system correctly and properly install an adequate HSF - the retail version does just fine for most installations - your system will run just fine and you won't even need to worry about it shutting down.
If the thought I thought I thought had been the thought I thought, I wouldn't have thought so much.