So I've finally hit the instability barrier in my overclocking. I haven't yet overvolted it, apart from increasing the Power Target to the max (117%). I don't want to shave off any more than 30% of my card's life span. And even if I only get a small boost for a dangerous voltage (compared to the boosts gained over lower voltages), please let me know. I don't want the max voltage/power within 70% life span. I want the most necessary voltage within a rough max of 70% life span, if I make any sense. So can anyone give me a recommended, safe voltage for my card to be overvolted to? My card is an ASUS GTX 670 OC (not TOP, OC. Model number in my spec list). With the power target on max like stated, and the card OC'd to the maximum stable without OV (1061 base/1140 boost), I get 60 Celsius degrees on Heaven and 65 Celsius on a (supposedly heat making) 218x218 window of Furmark. I think 70-75C degrees is the safe max on that, but I am open to recommendations from the pros on what is the safest max temp to allow on a DCUII GTX 670.