After you enter the BIOS, and before you go in to the M.I.T., hit Ctrl+F1 on your keyword. This will allow you to manually adjust timings. I've got 800Mhz RAM, so I keep the divider at 2:1. This keeps my ram around 880mhz.
I've got an E8400 in my DS3L, and still working on it. Sitting at...