Well KTE thanks for the reply. I am getting frustated here. Over at MSI HQ they assited but said i must not use 113 but here they say it more stable but no matter. Flashed bios correctly, got rid of boot error ,can get into Vista ...all fine but tried to run Dual channel and now pc don't boot. I have not set anything. all default. I am sure my memory was not on 1:2 divider and was running in ungaged mode. What are the Vdimm supposed to be, running a Phenom 9500.