I've run all my AMD-processors over 2V for several months, they have been working fine. Except for one, my duron 600 that i cramed 3V+ into while LN2-cooling it. It died  But i ran it at like 2,5V+ alot  I would say 2,2V is quite safe for long-term use if you cool the processor good.
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Asus A7N8X Deluxe, 2500+@2700MHz (13,5x200), 2x256MB TwinMOS pc3200 @ 2-2-2-11, GFFX 5900 Ultra@500/950MHz, 2x120GB Maxtor Diamondmax 9 8MB SATA raid-0, Prometeia, Logitech z-680. 20000+ 3Dmark2001
Duron 600@1521MHz RIP
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