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Hi, So a few things I would check right off the bat. In BIOS, do you have Mirrored Channel Mode, it is a type of redundancy for the RAM. <br />
Honestly, I would be surprised if this was it, so are these OEM memory? Did you upgrade the memory? Are there any memory related error messages when you boot up?
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Hi, So a few things I would check right off the bat. In BIOS, do you have Mirrored Channel Mode, it is a type of redundancy for the RAM.
Honestly, I would be surprised if this was it, so are these OEM memory? Did you upgrade the memory? Are there any memory related error messages when you boot up?

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What does the user manual for the server state is the maximum amount of memory that can be installed?
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What does the user manual for the server state is the maximum amount of memory that can be installed?

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Also, what version Windows Server are you running?
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Also, what version Windows Server are you running?

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It's windows server 2008 R2 standard memory limitation.<br />
we will consider upgrading the OS<br />
thank you very much.
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It's windows server 2008 R2 standard memory limitation.
we will consider upgrading the OS
thank you very much.

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There's a switch that can be set up in Boot.INI to enable the extra memory. /PAE though I don't remember off the top.
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There's a switch that can be set up in Boot.INI to enable the extra memory. /PAE though I don't remember off the top.

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did you add 16GB of ram in each processors' memory slots or did you stick the ram in one cpu's slots?
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did you add 16GB of ram in each processors' memory slots or did you stick the ram in one cpu's slots?

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<div class="content wysiwyg-content">
Hello, <br />
<br />
We have a Dell PowerEdge R420 which had 32 GB of Ram installed.<br />
We have increase the ammount of Ram to 64GB but when cheking in the system information it states that only 32GB is usable.<br />
How do we increase the capacity the server can use? <br />
<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/02_w09/1279403/Server.png" target="_blank" title="Server.png (8 KB)"><img alt="Server.png" class="file-block lazyload" style="max-width: 647px;" data-src="https://filedb.experts-exchange.com/incoming/2018/02_w09/1279403/Server.png" /></a>
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Server.png

Hello, 

We have a Dell PowerEdge R420 which had 32 GB of Ram installed.
We have increase the ammount of Ram to 64GB but when cheking in the system information it states that only 32GB is usable.
How do we increase the capacity the server can use? 



Server can't identify all the memory installed

Servers are computing devices that are similar to desktop computers in that they have the same basic components, but are significantly different in size, configuration and purpose. Servers are usually accessed over a network, and many run unattended, without a computer monitor, input device, audio hardware or USB interfaces. Many servers do not have a graphical user interface (GUI), and are configured and managed remotely. Servers typically include hardware redundancy such as dual power supplies, RAID disk systems, and ECC memory, along with extensive pre-boot memory testing and verification. Critical components might be hot swappable, and to guard against overheating, servers might have more powerful fans or use water cooling.

Server Hardware

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Dell is in Enterprise, Home Office and Consumer sectors of the market, supplying a broad range of customizable desktops, laptops, notebooks, servers, storage, and network devices.