96GB reported but only 64GB usable ??

[Fritz]

Win 7 Server 2012 R2 64bit DC. 6 16GB DIMMs installed. Why would Windows see all the memory and yet only use 64GB ?

Thanks

 

[Patriot]

Because micro$oft is ...
Microsoft Windows Server 2012 Memory Limits

 

[T_Minus]

License of key used ?

 

[Fritz]

It's Datacenter so memory is limited to 4TB.

I took out 2 of the DIMMs dropping install mem to 64GB and Windows now sees 64GB but says only 32GB is usable.

 

[Jannis Jacobsen]

check the bios that you dont have memory mirroring enabled.
also, if it is a dual system, make sure the ram modules are installed equally on all channels.
i also believe it has 4 memory channels, it might need equal ram modules installed on all channels.

 

[Fritz]

Memory mirroring isn't enabled and the BIOS is reporting 32GB. I double checked the manual to make sure I have it installed in the proper slots and I do. So it appears there's a problem with one of the slots.

 

[Patriot]

Memory mirroring isn't enabled and the BIOS is reporting 32GB. I double checked the manual to make sure I have it installed in the proper slots and I do. So it appears there's a problem with one of the slots.

Clean your cpu pads, dirty pads often give memory issues.

 

[Fritz]

I skipped both slot 2A's and now it reports 64GB with all of it usable so apparently I do have a bad slot.

 

[Fritz]

Clean your cpu pads, dirty pads often give memory issues.

OK, I'll give that a try. Thanks.