So jealous with your OC result, using stock voltage achieved 3.9GHz. You got nice batch processor! My E8400 Q827 Batch ned 1.3x Vcore for 9hr Orthos stable at 3.9Ghz. In my case, i ned 1.5 Vmch to stable at 433 FSB.
By the way, what i mean in last post is not Vmch cannot adjust. When you set 1.45 Vmch in Bios, in fact you get 1.5 Vmch.