Tried the latest Bitmain version, provided from Bitmain_Kiddy:

Some questions:

The AU3 is now recognized as "AMU"

With the parms provided in the autoexec.bat it hashes around 60 avg.
BUT: a lot, I mean a really lot of HW Errors

AMU0: invalid nonce - HW error

What does this mean

Probably I should change the parameters and go down with voltage and frequency ?

Have a look:
https://www.dropbox.com/s/lai4okp6qn6g819/Screenshot%202015-02-03%2012.11.05.png?dl=0

Opinions/help is very appreciated.
Probably these HW Errors are normal, but the 4.9.0 does not show them as a message and just counting them in the status bar ?