http://wiki.docking.org/index.php?action=history&feed=atom&title=How_to_check_RAM_detailsHow to check RAM details - Revision history2026-04-04T21:23:10ZRevision history for this page on the wikiMediaWiki 1.39.1http://wiki.docking.org/index.php?title=How_to_check_RAM_details&diff=10577&oldid=prevBenrwong: /* Finding out how much RAM you can get */2018-03-26T20:54:40Z<p><span dir="auto"><span class="autocomment">Finding out how much RAM you can get</span></span></p>
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</table>Benrwonghttp://wiki.docking.org/index.php?title=How_to_check_RAM_details&diff=10152&oldid=prevBenrwong: created page regarding how to retrieve RAM information2017-06-13T22:56:45Z<p>created page regarding how to retrieve RAM information</p>
<p><b>New page</b></p><div>Page will be interest those who want to find information regarding what RAM exists on their system and what compatible upgrades they can get. Examples below were run on a Dell PowerEdge R620 host, mem. <br />
<br />
===Finding out how much RAM you can get=== <br />
Use dmidecode -t memory | less to see useful information regarding what your computer can be upgraded to and what currently exists on your system.<br />
<br />
The first section of the output will show you what sort of memory to use, the maximum memory you can install, and the number of RAM sticks you can use.<br />
dmidecode -t memory<br />
Handle 0x1000, DMI type 16, 23 bytes<br />
Physical Memory Array<br />
Location: System Board Or Motherboard<br />
Use: System Memory<br />
'''Error Correction Type: Multi-bit ECC'''<br />
'''Maximum Capacity: 768 GB'''<br />
Error Information Handle: Not Provided<br />
'''Number Of Devices: 24'''<br />
From this output, we can see that the RAM sticks this motherboard supports are registered ECC (as is common with most servers). It supports a maximum of 768 GB over 24 slots which comes down to 32GB per slot. <br />
I know that this host has 2 processors which are Xeon E5-2680. If you look up the processor, you can see that each processor supports up to 384 GB RAM. So, 768 GB for the whole machine makes sense.<br />
<br />
The next section of the dmidecode output show what exists in each slot. The output here corresponds to ram slot with an 8GB DDR3 stick from Hynix:<br />
# Below information we can see total width is 8 bits bigger than data width which indicates it is ECC memory (the additional 8 bits are designed for error correction checking). <br />
# It has a size of 8192 MB indicating 8 GB. <br />
# It's DDR3 SDRAM that runs at 1600 MHz. <br />
# The manufacturer name sometimes shows up as an actual company name (ie Samsung/Crucial/Kingston) but sometimes it comes out as gibberish like below<br />
# Searching the part number online will usually yield the actual product<br />
Handle 0x1100, DMI type 17, 34 bytes<br />
Memory Device<br />
Array Handle: 0x1000<br />
Error Information Handle: Not Provided<br />
Total Width: 72 bits<br />
Data Width: 64 bits<br />
Size: 8192 MB<br />
Form Factor: DIMM<br />
Set: 1<br />
Locator: DIMM_A1 <br />
Bank Locator: Not Specified<br />
Type: DDR3<br />
Type Detail: Synchronous Registered (Buffered)<br />
Speed: 1600 MHz<br />
Manufacturer: 00AD00B300AD<br />
Serial Number: 35AB5CF9<br />
Asset Tag: 01124263<br />
Part Number: HMT31GR7CFR4C-PB <br />
Rank: 2<br />
Configured Clock Speed: 1600 MHz<br />
<br />
If the RAM slot is empty, it will look like this:<br />
# (Empty RAM Slot)<br />
Handle 0x1108, DMI type 17, 34 bytes<br />
Memory Device<br />
Array Handle: 0x1000<br />
Error Information Handle: Not Provided<br />
Total Width: 72 bits<br />
Data Width: 64 bits<br />
Size: No Module Installed<br />
Form Factor: DIMM<br />
Set: 3<br />
Locator: DIMM_A9 <br />
Bank Locator: Not Specified<br />
Type: DDR3<br />
Type Detail: Synchronous<br />
Speed: Unknown<br />
Manufacturer: <br />
Serial Number: <br />
Asset Tag: <br />
Part Number: <br />
Rank: Unknown<br />
Configured Clock Speed: Unknown</div>Benrwong