When I purchased the XPS 730X i7 920 with 6gb of memory I new in the future I would be upgrading my memory.

I tired to add Crucial 3 x 4gb 240 pin ddr3 pc3 10600 1333mhz to my pc. It would not detect. I tried to ajust and make sure a good fit was done, but nothing. If I had one old memory 1066 2gb and another of the new, I could get to the bios. However it would see the ram in the slot, but not detect. I tired to adjust the ram to run slower, but nothing works.

Anyone know why this is not working? I was led to believe that the board will take 1066 and up, with 1, 2, or 4 gb card with a max of 12gb.

Maybe there is a bios upgrade needed?