some news.
I've got the latest BIOS v0506 and put a pair Opteron 2356 stepping B3 onto the board.
First I installed Windows XP 64 but neither nTune works nor AMD overdrive and Clockgen.

Now I use XP 32 bit and nTune works at least.
FSB 250 are stable (2.875 MHz), higher isn't possible with nTune.

Does anyone knows another tool which works with this board and higher clocks?

Clockgen freezes the system, Overdrive doesn't even startup, and the BIOS options still show no effect.

So please help me to reach the 3 GHz