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Memory configuration on an HP Proliant DL380p Gen 8

Hi,
I don't understand how to populate the memory DIMMS on my HP Proliant DL380p Gen 8 server which has 2 processors.
Please can someone explain it in simple terms?

I have installed 8GB in 8 slots ( should be 64GB) but the server only sees 32GB (see attachment)
How do I fix this?
I am aware the slots need to be populated in a specific sequence but I don't understand it.

So 8 memory modules. Which slots do I insert them in?
RAM.PNG
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Scott C
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The population order looks correct so either mirrored memory or the limit of the OS, e.g. Win2012 foundation edition. Not quite sure where the screenshot comes from, it's certainly not what you see during POST.
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Hi Everyone, thanks very much for your comments.
The server is Windows 2008 R2 and the screenshot is from a Windows tool called BELARC.
BELARC runs an inventory on a system and displays a report.

I have attached pictures of the motherboard and the memory diagram.
Processor 1 is on the right. Processor 2 is on the left
I have an extra 16GB (2x8GB) that I would like to install to bring the total to 80GB
20170801_171714.jpg
20170801_171636.jpg
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@andy...good find on the 32GB limitation on Server 2008 R2 Standard.  I'd forgotten that.

OP...when you boot, does the full 64 GB show up during boot, but before the OS loads?

You may have everything installed correctly.
Hi Everyone,
The memory limit completely escaped me. So obvious. The first thing I should have checked but I was convinced it was the memory configuration. Thanks all for your assistance. I will upgrade the OS...
Thank you everyone!