Computer isn't using upgraded RAM

SummonHydro · Jul 11, 2016

Recently I upgraded my RAM, placing a 4GB DDR3 into the 2nd and last slot, making it a total of 12GB. When I started my computer, I looked and noticed that on the system information, it says there is 12GB, but only 7.94 is usable. Can someone help me unlock the other RAM so it can be used? Thanks!

bgunner · Jul 11, 2016

Many times you need to clear the BIOS and input the settings again. This forces the BIOS to scan all the ram allowing for all ram sticks to be used. This is a common issues when adding more ram to an already up and running system.

captaincharisma · Jul 11, 2016

does the system information show if you have a 32-bit or 64-bit operating system?

bgunner · Jul 11, 2016

captaincharisma :

32-bit OS only allows 3.5 GB of ram so IF the OP's machine is showing 7+ GB of ram then he is surely on a 64-bit OS.

SummonHydro · Jul 11, 2016

bgunner :

Did you mean go into the BIOS and restore back to the default settings? Because that didn't work either.

Tradesman1 · Jul 11, 2016

What mobo, CPU and model #s of the DRAM? There's no guarantees when mixing DRAM

darthvader30 · Jul 11, 2016

Check for a BIOS update. Mine had a similar problem and a BIOS update fixed it. Also check this:
https://support.microsoft.com/en-us/kb/978610

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Computer isn't using upgraded RAM

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