Windows 10 64bit 8GB RAM installed 3.98GB usable?

Fake 64bit? lol


Check the bios, might be out of date, also check bios settings, I know there is a setting somewhere about extended memory support on these old boards. Some setting.
 
1. Reseat the RAM
2. Check BIOS settings
3. msconfig > Boot, select the OS and hit advanced, check what your maximum memory is set to, should be unticked.

What does your display in dxdiag say?
Polymathic said:
Maybe the CPU only supports 4GB?
Click to expand...

Don't think so, it's 64 bit. Here is a video where the person used 16GB of RAM (2x8):
E.g. Intel's rating is usually whatever the largest that was addressable when the chip came out, I've used more memory on my old i7 950 when I still had it (was 24GB addressable as 6x4GB official as was largest when it came out, I had 2x8GB and 4x4GB a few years later).
 
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Not my PC can only check on the weekend but I did a clean win10 64bit install for the person beginning of the year and it had full 8GB usage back then and no hardware has changed since then. The gpu is a 2gb gtx660.

Keep the suggestions comming.
 
Have seen this a few times on AMD hardware. Once is was a failing cpu, sometimes bent/crimped pin(s) on cpu.
 
ponder said:
Not my PC can only check on the weekend but I did a clean win10 64bit install for the person beginning of the year and it had full 8GB usage back then and no hardware has changed since then. The gpu is a 2gb gtx660.

Keep the suggestions comming.
Click to expand...
Take a Linux Live disk.
If it detects 8GB you are gold.
Reformat and install 10. Get the 20H2 build.
 
Uhm... assuming it has two mem sticks..... one of them died or is being misreaded?
 
Johnatan56 said:
1. Reseat the RAM
2. Check BIOS settings
3. msconfig > Boot, select the OS and hit advanced, check what your maximum memory is set to, should be unticked.
Click to expand...

In bold is all you need to do

Or tick it and type in 8192
 
ponder said:
Not my PC can only check on the weekend but I did a clean win10 64bit install for the person beginning of the year and it had full 8GB usage back then and no hardware has changed since then. The gpu is a 2gb gtx660.

Keep the suggestions comming.
Click to expand...

Not sure if it applies to your cpu, certain early x64 amd cpu had support for 64 bit instruction sets but did not have support for virtual memory extensions for above 4gb, consumer ddr400 boards at the time supported 4 x 1gb ram at most.
 
Mystic Twilight said:
Not sure if it applies to your cpu, certain early x64 amd cpu had support for 64 bit instruction sets but did not have support for virtual memory extensions for above 4gb, consumer ddr400 boards at the time supported 4 x 1gb ram at most.
Click to expand...

I did a clean win10 64bit install for the person beginning of the year and it had full 8GB usage back then
Click to expand...
 
Roaches in your mainboard. I had the same issue but a can of Doom sorted it nicely.

Check your BIOS configuration (Some boards have weird support configurations). Could also be a faulty ram module.
 
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