Here is a thought . I cannot get more than 4 GB working , changed the bios from F4 , to F5 , to F6 ( Gigabyte GaX58a ud3r ) and it registers all 4 modules and 8GB , BUT does not get past the starting windows screen . IF , as most think , it is a slot / socket problem then why should the bios change make a difference ? Revert back to F4 / F5 and back to 4 GB . There is some material here for someone smarter than me to work with .