What you were told is BS, sorry if it is harsh. No CPU can be more stable than another in a said program, if both are well cooled, and both are not overclocked.
Now 3dS Max 4 has begun having different results thanks to recent SSE 2 optimizations, so you never know.
<A HREF="http://www.anandtech.com/cpu/showdoc.html?i=1635&p=10" target="_new">http://www.anandtech.com/cpu/showdoc.html?i=1635&p=10</A>
Here the AthlonXP 2200+ competes very well the P4 2.53GHZ. The XP is clocked at 1.8GHZ and can compete because it has the FPU power at its hands. You can pick up a 2200+ for less than half the price of the 2.53GHZ, and get about 2-5% less performance in it. I don't see you stating any Dual Processor setups, so 3dS Max 4 on a single processor is fully directed at the Athlons.
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You are about to witness crazy, mindless, eye-gagging, naive programming, welcome to FOX!