Ive used a custom bios to set 1.263v (which is the same as setting 1.2v i assume). The most I can get is 730mhz on the core. I am running an s1 with a 120mm fan with temps never going above 50C. Before this voltage increase the highest clock speed I could get was 680mhz.
Jzsteam, you should unlock all of it and change the voltages for clock info 7-9 as well. Also, use furmark stability testing to get the highest stress on the card.
Heres what I'm currently using
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