Yes probably
Another option to investigate could be the advanced memory configuration settings menu.
Also, I had to set the delays skew to 300 ps for channel A and 450 ps for channel B to make it works stable.
Now, if it would be possible a slight modification of the menus to adjust the values in 50 ps steps (as in 4coredual-vsta bios) instead of 150 ps (my bios) it would be great.
Do you know someone having the 4coredual-VSTA to ask some screenshots of the PCI control register values ?