Half of my memory not showing up

okpac · Feb 17, 2014

In my BIOS it shows only half of the installed memory under total memory.

I have installed my OS and under system memory it shows up as the whole 8GB (but 3.90GB usable).

Does anyone have any help?

I'm wondering if there are settings in my BIOS that I'm not setting right?

Using ASUS UEFI BIOS Utility - EZ Mode

System:
AMD FX6300
Asus M5A97 R2.0
PNY Geforce GTX 660
2 - Kingston Hyper X Beast 4GB
Corsair CX430
Corsair 230T

Ahmadjon · Feb 17, 2014

32 bit OS cannot use 8gb RAM only 4GB so change your OS to 64 bit

laviniuc · Feb 17, 2014

your windows is 32bits. limited to 4gb total ram. you need to reinstall windows 64 bits version

okpac · Feb 17, 2014

laviniuc :

My OS is set to 64 bit already

tachybana · Feb 17, 2014

Test each memory module separate and ensure you have the latest bios

littleleo · Feb 17, 2014

If you are using a 64bit version of Windows you should be able to access all your memory unless you memory isn't properly installed or one of the 4GB mods is bad. As Tach says you need to test your ram. Pull both stick out and put in one and start your computer. If it is able to read it turn off your computer and change the stick to the other and turn on your computer, If it is able to be read the reseat both on the motherboard and see if you are now getting all 8GB. If not try another pair of slots you may have a bad memory slot. Your memory slots should be color coded be sure you seat them in the same color.

laviniuc · Feb 17, 2014

8gb available 3.9 usable can mean only 1 of 2 things:

-either 32bit os (btw, okpac - you don't set the os to 64 you install the 64 bit version)
-or as suggested above, certain motherboards need a bios update before they work properly with 8gb - but this is very rare

a bad stick would either not show at all (4gb available 3.9 usable) or would crash when posting/loading windows.

littleleo · Feb 17, 2014

It sure sounds like the OS version is 32bit and not 64bit.

Ahmadjon · Feb 17, 2014

Maybe while installing the OS you've chosen x86 not x64 platform, because x86 also known as 32 bit

okpac · Feb 17, 2014

littleleo :

laviniuc :

I installed the x64 OS. On the system panel it shows:

64-bit Operating System, x64 based processor
Installed memory (RAM): 8GB (3.90 GB usable)

I have tried the sticks in every imaginable way and started the computer each way with the results being exactly the same as it was before I moved the sticks around.

Ahmadjon · Feb 17, 2014

Just try to use your RAM on other PC

okpac · Feb 19, 2014

Ahmadjon :

I installed the ram it another computer and they worked fine no problem.

Ahmadjon · Feb 19, 2014

okpac :

Then its 100% OS issue

laviniuc · Feb 19, 2014

get knoppix for example (works from cd or dvd or usb stick):
http://www.knoppix.org/

to see if it recognizes all your ram.

littleleo · Feb 20, 2014

Okay you can verify its a not a 32bit install by going to the control panel and selecting system and see what is says next to System type.

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Half of my memory not showing up

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