Barcelona Opteron 2350(B1) arrived

[cpuz]

I presume multiplier is upwards locked in new Barcelona's?

Yes

Also is it possible to set vcore higher than 1.2V using C'n'Q or this is maximum allowed?

Max VID is 1.55V.

What is maximum vcore for northbridge?

This depends on dual-plane or single-plane configuration, and I still miss the register values to tell. On Kyosen system, the NB VID is 1.2V on the B1 and 1.15V on the BA.

Can you use half multipliers on Barcelona?

Yes.

If yes will we see any performance drop from using .5x as on K8?? (mainly lower memory bandwidth).

I don't know. On K10, memory clock is computed from bus speed, and it therefore not dependant from CPU speed anymore, so this is tempting to say "no", but only a real test can tell.