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Location of DDR4


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#1 carbuff

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Posted 16 October 2017 - 07:59 AM

I have two different DDR4. For performance, does location matter? Or, should one be placed in slot 1 and the other in slot 2 in my desktop. 

8192 MB speed 2400 MHz (came installed with new desktop).

16384 MB speed 2134 MHz (taken from former desktop).



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#2 hamluis

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Posted 16 October 2017 - 08:33 AM

I don't believe it matters, since the system will only operate at the lower speed of differing RAM modules, assuming that each module is compatible with the system.

 

If you want, you can try Module 1 in each slot, then try Module 2 in each slot...to confirm that each works properly when installed singly.  If they do, then you can install both in any alighnment you like.

 

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#3 carbuff

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Posted 16 October 2017 - 08:37 AM

Thank you.



#4 dc3

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Posted 16 October 2017 - 10:55 AM

Actually... the population of the RAM is important.  For example, if you have a matched pair of modules they can be run in dual channel which effectively double the throughput speed of the RAM.  But if the modules are not populated correctly it will not run in dual channel.

 

If you post the make and model of this computer I will find and post the proper slots to use when installing the RAM.


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#5 carbuff

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Posted 16 October 2017 - 10:59 AM

Acer® Aspire® XC Desktop PC AXC780UR12



#6 dc3

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Posted 16 October 2017 - 12:05 PM

I'm going to have to leave shortly.  My search did not locate a user manual for this computer in the time I had to search for this information.  If you have the user manual it should have a section for installing the RAM and how it should be populated.  For example, some DIMM slots are labeled 1, 2, 3, and 4.  Usually for dual channel you would use slots 1 and 3, but this changes with different computer models and manufacturers.


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#7 carbuff

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Posted 16 October 2017 - 12:44 PM

Thank you for your comments.   The user manual does not have any detailed info regarding ram/memory.  I will continue to look.

 

See that you are in N. California.   Hope you are safe - and stay that way!



#8 Kilroy

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Posted 16 October 2017 - 01:40 PM

According to Crucial there are only two slots for RAM in that system.  I'd put the 8GB in slot 1 and the 16GB in slot 2.  Since they are different sizes dual channel isn't going to be an option, regardless of the speed difference.



#9 dc3

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Posted 17 October 2017 - 08:39 AM

There are only the two slots, but these will take either RDIMM (Registred) or UDIMM (Unregistred) modules, Crucial only carries the UDIMM .  Please provide the Speccy Snapshot, this should tell us exactly what is installed

 

Please download and install Speccy to provide us with information about your computer.  Clicking on this link will automatically initiate the download.

When Speccy opens you will see a screen similar to the one below.

 speccy1.png

Click on File which is outlined in red in the screen above, and then click on Publish Snapshot.

 speccy2.png

The following screen will appear, click on Yes.

 speccy3.png

The following screen will appear, click on Copy to Clipboard.

In your next post right click inside the Reply to Topic box, then click on Paste.  This will load a link to the Speccy log.


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#10 carbuff

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Posted 17 October 2017 - 08:44 AM

http://speccy.piriform.com/results/D2LN0IwtWPzIpbPNrOpfdHN



#11 MadmanRB

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Posted 17 October 2017 - 09:19 AM

Well according to speccy it looks like it is indeed in dual channel mode.

Would make sense if it only has two memory slots.

If four slots it would be different.


Edited by MadmanRB, 17 October 2017 - 09:34 AM.

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#12 carbuff

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Posted 17 October 2017 - 09:29 AM

Thank you all.  I do appreciate your assistance.



#13 MadmanRB

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Posted 17 October 2017 - 09:34 AM

You are welcome.


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#14 dc3

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Posted 17 October 2017 - 11:32 AM

Well according to speccy it looks like it is indeed in dual channel mode.

Would make sense if it only has two memory slots.

If four slots it would be different.

If the were four DIMM slots you could still run the RAM in dual channel.  Dual, triple, or quad channel all depend on what the motherboard is configured to run.  Obviously this motherboard is configured to run in dual channel, this means that if there were four DIMM slots and you used four matched modules you would be able to run all four modules in dual channel.


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