Yeah I do them both individually using afterburner.  I prefer afterburner or something similar over bios flashing, its a little safer, easier to fine tune and change for different currancy. The adjust, flash, restart, test and repeat method is just way too tedious. Same reason I prefer the copy&paste method of modifying the straps. I dont know enough about it to tweak em to the max. For eth I just adjust the mem clock to get the highest hash rate and then underclock the core till it starts droppin. Seperately I can get about 30 mh/s with the 580 on crimson and about 25 mh/s with the 470 on asus...right now together on adrenaline Im getting about 25 and 19, which really isnt bad i guess but just knowing theyre both capable of more drives me nuts..