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Acer Aspire E5-573 not recognizing second dimm.

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So the problem is that my laptop does not recognize both ram sticks when I put them in together.
I have a 4GB stick that came with the laptop and I had another 2GB stick lying around and decided to do a minor upgrade. Alas, I don't see 6GB of ram when I boot up. The system (and the bios) only recognize 4GB (the original stick that came with the laptop).
I have tried

  • switching the sticks around
  • booting up with only 2GB stick
  • booting up with only 4GB stick
  • 4GB stick in other laptop
  • 2GB stick in other laptop
  • 4GB stick from other laptop in both slots

All of the above yelided no results, in the way that everything was fine when I tried any of those. The laptop booted up every time, and the other laptop (the tester) booted up with all of the above mentioned sticks. So I guess it's not the sticks, or the slots?
The fun thing is that the task manager, system manager and bios all show only 4GB while CPU-Z shows the full 6GB and sees both sticks.

taskmanager.pngcpuz.png

cpuz1.pngcpuz2.png

 

So is it because of the mismatch of the speed, of the cas or of the voltage?
If so should I generally just be better to get one 6GB or one 8GB (1.35v ??)?


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