Why is 4GB available out of 12GB of RAM?

Question

Iron

I have 4GB of 2, and 2GB of 2, I have no restrictions on RAM in Windows, I have Win 10 Pro (which supports up to 2TB of RAM).

Answer 1

1. Part of the memory is taken by the video card.
2. Limit of edition or bitness of the operating system.
3. Software limitation.
4.Reserving memory by the system.
5. Faulty RAM.
6.Restriction on the part of the processor.
7. BIOS error or the need to update it.
8.Limit the maximum volume that the motherboard supports.
9.The motherboard does not support one of the memory modules.
There can be many options

Answer 2

32 bit ten is worth, or what?

Answer 3

1) Reset bios settings
2) First, try to install one bar at a time in the first memory slot and start the system. This way you can check compatibility.
3) If all memory sticks are compatible and working, then you need to put memory with a lower frequency (or a worse manufacturer) in the first slot.