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Discussion Starter · #1 ·
Hi everyone,

Further to my original post from last year:
http://forums.techguy.org/hardware/988927-max-ram.html

I have a problem where whatever amount of RAM in my PC, the BIOS registers only half.

At the time of my original post, I had 8GB RAM installed. Only 4GB was registered by the BIOS (i.e. when I went into the BIOS, it showed the RAM at 4GB). However, the OS and CPU-Z registered all 8GB. Task Manager Resource Monitor showed that the missing 4GB was "Hardware Reserved". However, I believe this is just a red herring, as their shouldn't be any RAM reserved for hardware that can't also be accessed by additional resources. Besides, that theory falls down at the next point...

Today I tried my computer with 12GB RAM. This time the BIOS saw 6GB, the OS saw all 12GB and resource monitor registers 6GB reserved for hardware.

I haven't made any other hardware changes so the memory that is "hardware reserved" can't have increased by 2GB - I therefore think this is simply a non-header, used when the OS can't detect what the RAM is being used for. Maximum memory (msconfig) is unchecked and I can verify that the RAM sticks are all healthy.

I thought it might be the motherboard, but can't understand why the RAM is halved. If I had increased the RAM and the BIOS limit had stayed at 4GB I would've understood. It's almost as if the BIOS is initially reading the full amount of RAM, and then halving it (perhaps during POST or something).

Any thoughts? I have noticed I am not the only person to have faced this issue. Anyone have any experience in this matter?

Thanks for your help, all!

FYI - my specs:

Mobo: ASUSTek Computer Inc P7P55 LX
Processor: Intel Core i5 2.80GHz
GFX: Radeon HD 5770 (1024MB)
RAM: 2 x 4GB Corsair DDR3 PC3-10700H (667MHz) & 2 x 2GB Corsair DDR3 PC3-10700H (667MHz)
OS: Windows 7 Home x64
 

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The only time I've seen anything like this ws when the wrong RAM was being used. In that case, someone had tried to use ECC RAM or registered RAM in a machine that needed non-ECC, non-"server" RAM.
 

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Discussion Starter · #3 ·
Hi Elvandil,

Thanks for the response. I suppose you're right, but I'm fairly confident the RAM installed isn't ECC. THAT SAID - I have some more coming from crucial in the next day or so, specifically recommended for the mobo. Fingers crossed. I'm not hopeful though.

Btw, I flashed my BIOS to the latest version, slightly hopeful after seeing some updates, but to no avail.

Any advice from anyone is greatly appreciated.
 
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