HI James,
I wonder if you have this fixed as I have now joined the Win & BSOD club. My sones Advent Centurian won'rt load memory above 6gb without BSOD. I have updated everything bar the bios (PC World will do this for me soon!) the Crucial 4gb sticks work in all slots as does the orginal 2 gb sticks.
again this PC gives 12gb in safemode but crashes all the time in normal mode with >6gb ram. It does crash just past the windows sign on screen and last night booted to desk top with 12gb but then crashed when Minecraft was loading!
great to hear if you fixed it or will update post letting PC World have it.