We have an M910 with 64Gb RAM (16 x 4Gb), RAID 1 (2 x 100Gb SSD - 50Gb free) running Win 2008 R2 Enterprise. When I change the memory to 16 x 16Gb RAM modules it shows the 256Gb in the BIOS, no errors on POST but on Windows startup splash screen we get the BSOD. When we put the original RAM back it works fine.

Anyone have any ideas please.