Entry level laptop introduced in 2015. Comes in a range of processor options from the Celeron to the Core i7. Also comes with a few AMD processors, but most are Intel based.

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Upgraded ram is showing but unusable.

I have Acer Aspire E15 E5-553 laptop which has two slot with total DDR4 4GB memory. I have replaced one memory with crucial DDR4 4GB 2133 MHz laptop ram. Total memory shown in bios is 6GB. But when I see ram information in control panel of the windows 10 it is showing that 2GB is in used out of 6 GB. Moreover, when I removed all RAM and using only the replaced RAM the computer do not start and bios screen also not shown. What is wrong? Is the Crucial RAM is not compatible with my computer? Appreciate your help.

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When buying ram, you need to match exactly the following things with the ram you already have in:

DDR type

Clock speed (usually presented as Mhz)

Voltage

Size of module (typically, but not always a requirement)

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http://community.acer.com/t5/E-F-V-and-M...

Especially note this sentence....

Try to match the dimm that's in there or better, buy a matched pair.

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