"but few points here
you can't set the max and the mix to the same value
it will load the min the one right before the max one ex : in your case 550 would be the min"

In fact, you CAN set the max and the min to the same value.

I know because I did it, and I haven't noticed any resulting problems.

Furthermore, if you read the original overclocking thread, you will see that someone (I think it was jakiman) ran lots of tests with max and min set the same.