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<blockquote data-quote="KennyC" data-source="post: 1843296" data-attributes="member: 401215">Just an update, for some reason I’ve been unable to get logged in until this morning to update this.Anyway after running the memory test and passed from Kelly I had the issue return with reboot, so I got an appointment with Apple Store under my Apple Care and they ran tests finding one of the modules were bad. So I had them erase SSD and reinstall Catalina and leave one module in. They told me I should install in pairs but agreed to do.When I picked up my Mac I asked the person about why I should install in pairs and she replied because there are four memory slots, now this didn’t make any sense to me. So once home and reading some this is what I got about this memory.This Mac uses dual channel memory which is more efficient that single channel so when using one module it reverts to single channel memory which will be a little less efficient. Does this make senses and true? Things so far seem fine and once I get the rest of my stuff installed I’m gonna clone it with CCC because my other clone was with Mohave. Do you think having two clones with different OS’s would be an issue?</blockquote>

[QUOTE="KennyC, post: 1843296, member: 401215"] Just an update, for some reason I’ve been unable to get logged in until this morning to update this. Anyway after running the memory test and passed from Kelly I had the issue return with reboot, so I got an appointment with Apple Store under my Apple Care and they ran tests finding one of the modules were bad. So I had them erase SSD and reinstall Catalina and leave one module in. They told me I should install in pairs but agreed to do. When I picked up my Mac I asked the person about why I should install in pairs and she replied because there are four memory slots, now this didn’t make any sense to me. So once home and reading some this is what I got about this memory. This Mac uses dual channel memory which is more efficient that single channel so when using one module it reverts to single channel memory which will be a little less efficient. Does this make senses and true? Things so far seem fine and once I get the rest of my stuff installed I’m gonna clone it with CCC because my other clone was with Mohave. Do you think having two clones with different OS’s would be an issue? [/QUOTE]

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