Bios mod worked for me too.

Before bios mod, AT reported error anything above 702 for the core and 1674 for the sahders.
After the mod I can go up to 720 and 1836. But at 1836, At don't detect any error but I can clearly lots of yellow dots so I'm settling at 1782.

Now when I put both core and shaders at their maximum 720/1782, I got some very rare yellow dots. Seems to be ok at 720/1728.

Am I hurting the hardware when I see yellow dots ?

Anyway I'm going to test the stability with Crysis and if I don't have any artifact at this speed I'll be happy like that.