^^ Now on that mem thing I could be completely off base... that was a complete guess just FYI. There is reasoning behind it, but as I don't know how these drivers are programmed, that reasoning could be crap...

And I go by SC process of single bumps (after an initial jump)... but I do shaders, mem, and core, all one bump at the same time. If anything fails you can take it all back one bump and proceed forward on each one individually if you wish...