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hpz800 48gig of ram reduces useable ram on each reboot

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HP Z800 WorkStation
Microsoft Windows 7 (64-bit)

Hi all, hope somebody can shed some light on this and would appreciate any help.


Twin cpu configuration and 48~G matched ram.


#Install Win7 Pro - no problem 48Gig Ram 48 Useable


restart a couple of times 48Gig ram 32 Useable


will drop eventually to 24Gig.


Fuction seems the same speed but what is reporting this loss in useable ram?


I have tried fresh install


Upgrade to 10 pro


Thye station streams pool competition video, 16 cameras through media pci card by Avermedia but even with these out is still reduces the useable ram.


Thanks in advance



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is the system reporting any memory related errors when it's booted/rebooted


you can have bad ram, which the bios will map out on startup, also a bad memory socket/bad connection will cause this


also installing diffrent memory module sizes in the wrong sockets/order will also cause memory related issues


the proper memory order is largest modules first in groups of 3 (the z800 has a 3 chanel mem controller)


for proper placement look at the side cover, it shows the proper order to fill the slots

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