O.K. - here are first results. All done with BIOS 0209 and 2.4 Vdimm (Vmem):

C4:



C3:



As You can see the RAM on this board is limited by the 975 chipset and/or BIOS. Will try 0215 BIOS next days......

Hard to find stability - can only be fixed by a better BIOS released by ASUS (maybe 0215?) or we have to wait for RD600 and buy again a DFI board..

When trying lots of settings I can feel the RAM can do a lot more.

Finally one question, where is the point in searching for the highest mem frequency?

Remember this pic C4 with mem at 542 MHz:



And now watch this C4 at low 434 MHz:



Almost the same SP1M result - same CPU speed. So why all the work?