As it turns out, the machine isn't overheating at all; it's staying below 40 C consistently. However, rebuilding GCC fixed the segfaults in the compiler, but the machine still hardlocks when faced with too much processing stress. Maybe this has to do with the infamous TLB bug present in the CPUs, but it's hard to say.
At the moment, I'm upgrading to GCC 4.3 on the machine, which has some Phenom-specific flags that can be used.
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