I think this could have something do with 16GB dimms being a new thing and not supported by Intel on the laptop chipsets. Lenovo has a similar problem in their

I think this could have something do with 16GB dimms being a new thing and not supported by Intel on the laptop chipsets. Lenovo has a similar problem in their new models. X240 has only one dimm slot and currently supports max 8GB of memory. While investigating the issue I found a discussion[1] where somebody mentioned that Intel would need to add support for these new dimms in the "memory reference code"[2]. [1] http://forums.lenovo.com/t5/X-Series-ThinkPad-Laptops/16GB-memory-for-X240-available-does-it-work/td-p/1476774 http://forums.lenovo.com/t5/X-Series-ThinkPad-Laptops/16GB-m... [2] http://en.wikipedia.org/wiki/Memory_Reference_Code http://en.wikipedia.org/wiki/Memory_Reference_Code