When I bought a new laptop it had 4 GB RAM. Then after 1 month I added 4 GB RAM in the second slot. And it shows 7.88 GB RAM usable. After some time it showed 6.4 GB RAM usable and 1.4 GB hardware reserved. So I formatted and installed Linux. Now in Linux it shows only 6.2 GB RAM usable. I have talked to Dell customer care. And read many forum. I searched Google a lot, but nothing helped me.
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1What did you try already? Before you formatted, what OS were you using? You can [edit] to add. – wjandrea Nov 13 '18 at 20:25
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First of all, make sure your looking at the right stats. Perhaps you are looking at the available memory and not the total memory. Run this command in the terminal:
free -m
and see what it says.
Another possibility is your new ram is just bad, and may need to be replaced.

AustinKP
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i have checked the ram in another laptop always working fine. free -m total memory 6375 – Ghalib Ansari Nov 14 '18 at 06:21
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Definitely sounds like bad RAM then. Might wanna see if you can return it... – AustinKP Nov 14 '18 at 23:32
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