For 250 FSB i set timmings at 11-3-2-2.5
For 246 FSB i set timmings at 11-3-2-2 and was stable.....

I also tested 11-3-3-2.5 to have stable 3D at 250 FSB but no luck until now....
I will raise VDD up to 1.8-1.85 and redo all Becnhes from begining...

The BIOS 1.0 goes from 245 FSB (246 measured with CPUID) directly to 250 without midle steps like 246 - 247- 248 - 249 and this was another problem.....
But since now all are running very stable and FFFFFAAAAAAST.......