With BIOS 810 I also have problem with C1 & booting after crash, but 823 is better.
No more C1 issue but booting problem still sometimes occurs.
Also it has a problem with 5/8 divider.
So far this is what I get :
Decent chip you've got there Dihon . Will it prime at those settings, and what stepping is it?

The only thing I will say is that running 1:1 like you've got there, does seem a lot easier stability wise. I can run 3-3-3-9 at around about that speed.

It's when trying to hit 1000+ on one of the other dividers, that problems seem to kick in. Especially on 4-4-4.

RLM