Heureka.. I'm more than confused now, but it works at 11*200..
settings are:
interface : aggressive
ram : 100% 11-3-3-2,5
throttling off
agp 66MHz
core 1,71V (+10%)
ram 2,77V (+0,1)
my PCI cards are uninstalled, but I think that was not it.
I took out one ram bar and it booted correctly. And surprisingly it even worked after installing the bar again.
The performance rised tremendously.
I remember a CPU score in Aquamark with 11,5*195 at 7200
now at 11*200 its 7800 I don't know what I did, but the chains are broken and the CPU likes its freedom. The CPU is even cooler now!
Also tras at 11 rises ram performance..
North and Southbridge are actively cooled, but this shouldn't be the trick.
I removed every cable in the case.. maybe something wasn't connected correctly.
Thanks for your patience and help.
I wish I knew what I did.
And I wish I hadn't bought cooling equippment out of frustration. lol