Is There a Maximum Amount of RAM Loaded Per Core on the Processors

I hope I'm asking this question in the correct group.
We use AutoCAD Civil 3D which only uses one core of a multicore processor.
We seemed to have reached an impasse with AutoCAD and Windows with RAM usage. It appears that Windows will only load a maximum of 15.8GB RAM into the first core of a Intel Xenon or Intel I7 processor.
We have a rather large drawing that is roughly 48GB in size. This drawing opens on all the tested systems in about 33 minutes on a xenon system with 16 GB RAM, xenon system with 32GB RAM, I7 system with 32GB RAM and an overclocked I7 system
with 64GB RAM. The OS is Windows 7 64 bit and Windows 8.1 Pro.
Watching the resources on all the machines during the drawing opening the network throughput varies from 100Gbps to 500Gbps and when the first core reaches a maximum of 15.8GB RAM the throughput drops to around 72Kbps! These results are almost identical
on 4 different setups with RAM ranging from 16GB-64GB.
The 16GB system pulls all available RAM, 32GB and 64GB systems would only pull at the most 15.8GB to the first core.
Is this 16GB core limitation a Windows issue or an AutoCAD issue? AutoCAD is telling us we may have reached the core limit in windows.
Regards.

Hi，
As I know, there are 3 factors that limit the highest RAM amount your computer is able to see: 32 bit or 64 bit CPU, RAM limit of OS and RAM limit of motherboard. for CPU, 32 bit CPU can only has a limited 4 GB RAM, while 64 bit windows can has more RAM,
depends on the Windwos Version (you should also exclude some RAM used by audio\video\network memory). and motherboard manufacturer is the important one who decides the maximum RAM amount that can be supported, the only sure way to know is to consult your motherboard
manual\view the manufacture website\contact the manufacture.
Yolanda Zhu
TechNet Community Support

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