I don´t really understand what is going on right know, but OK..

1. I did.. Saved my old bios, modified it as dicriped. Restore it to BIOS. And the card wan´t identified from system anymore. Then i restored the old Bios and all is ok.
2. Why do you think i have done that?
3.That is exactly what i wanne to do.
4. I´ve seen tons of tutorials, how to modify th rx 470. But most of them, all show just to modify 1750 1900 2000 row. And that is the onlny thing i have done, with polaris.

But doesn´t matter. The speed is enough for me and i got the power usage down..Thats OK..

Hmmm, now i´m a little bit in panik, to ask my question:-(
I´ve gotten my 5th RX470 today. I have 2 X 750CM+80 Corsair. OS can´t install the driver for the 5. card. doesn´t matter wich one it is.
Is there might be a limitation in Window 7 proff.? All Cards are working fine, as long as they are not the  last one, installed.

I´m sorry if this is a school question again. It is not my opinion to get any special attention. I´ve read most of this thread and there are a lot of qustions regarding the rx470..I´m sorry for my last post. That was not, to get anybody in stress to help me, really..

Regards,
Scandalrosi