A1425 - Crashing under load

This logic board keeps crashing, but only under load. Likely heat related? Any suggestions on this one, I'm not really familiar with this model.
 
Sorry, bumping my old thread. No odd temperatures (CPU ±80C when it crashes) reported. EFI ASD 155 won't run, I think this is caused more older macs because of a recent EFI update.
 
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