Hardware Reserved Memory

Hi
We have a DL580 G7 server, recently we add up some memory to this server. now it has 512 GB RAM
but in task manager it shows 384 GB useable and 128 GB is hardware reserved
what is the hardware reserved and how can I use this 128 GB ?
OS is Windows 2012 Standard x64

I see you have asked the same question at HP forums, and have had a response there from HP staff, probably you will have to follow the guidance from that forum, which has supplied the hardware-specific guidance you need:
http://h30499.www3.hp.com/t5/ProLiant-Servers-ML-DL-SL/DL-580-G7-Hardware-Reserved-Memory/td-p/6718204
Don
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