Well, what you obviously don't know is what we do with the (admittedly small) percentage of Micron D9 ICs that do not meet the PC8500 bin. Those are used in the PC6400C4 Pro and PC6400 Dominator. The PC6400 Dominator is now discontinued and replaced with the Promos based PC6400DHX models. So, "some" PC6400C4 Pro could still today be made with Micron D9s. And, none of us know how old the OPs modules are.
It is very clear from all your postings that you don't like Promos ICs. That's great. But remember, this thread is not about what you want, like, or don't like. So, until we know more about the OPs revision of modules, it's a pointless discussion. He may have Promos or Micron based versions of either memory listed here, ST or Corsair. So, I am focusing on my customer's needs here, not yours.
You might want to stick to things you know. I have seen users recently buying the Pro sticks and getting the Micron revisions.
And, EVERY RAM manufacturer out there worth mentioning is using Promos ICs at times as well as Quimonda and others.