Voltages up to about 1.65V are considered safe. You can't change the multiplier with an Intel CPU, so you can only change the FSB. The temp shown both in the BIOS and in Windows-based monitoring applications varies immensely depending on your mobo. Asus boards read at least 10 C lower than, Abits. According to my Abit, the CPU in my sig goes up to 64 C under load on hot days. Never had a stability problem, though.
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