>>>No. 192GB is max.
>>>
>>>See http://msdn.microsoft.com/en-us/library/aa366778(VS.85).aspx
>>
>>Could it be a limitation of the motherboard?
>
>Yes. I'm not aware of a motherboard that can physically handle 192GB of RAM. If one exists, I wish I had it!
>
>This is why my laptop has 8GB - that is max for my Dell.

The Dell Precision T7500 has 12 memory slots, each of which can take a PC10600 stick (1333 MHz) of up to 16GB....thus 192GB.
Cisco supposedly has blade servers that can handle up to 384 GB in memory.