The NewCastles - and yours is definitively a NewCastle - seem to be good overcockers.
I got one a few days ago and have not yet tested very much...
But I was able to set my 3000+ NewCastle to 2400MHz from the beginning.
And that is not even with default Vcore but with undervolting to 1,45V (default is 1,5V)!
Absolutely (Prime, SuperPI, 3DMark etc.) stable!
So I guess that the new stepping is not only improving RAM compatibility but also the production process.
Get your NewCastle, 100$ is a very good price!
Cu,
B3