Have tried the 56.72, 56.64 and currently she is using 44.03 (no difference with any of them). As for the CPU overheating, that's a possible, though I don't think it is in this case. I have never seen a CPU overheat and only drop to desktop. Still I'll likely check it in the next few days. Thinking of adding another fan and that would be a good time to check while I have it opened up.