As you can see from the picture, not only the BIOS sees my 12GB, but Windows does too. It even shows it in the Task Manager, not just the CPU-Z.
Strangely though, it doesn't use them.
I have to note at that point that:
- Ubuntu does that too, even though it detects the 12GB RAM as well
- I've recently installed SSD and installed the fresh Dual Boot in them
- In the old setup (HDD) the 12GB was completely usable on both OSes.
- It says in the details that 4GB out of them are Hardware Reserved, so I have the questions:
- Why did that not happen in the previous install?
- Why doesn't Ubuntu use them as well then?
- Why OS uses a big amount of RAM even though I have a few light programs running?
My question is not duplicate of Why is all my extra RAM marked as “hardware reserved” in Windows 7? in my opinion as my only mistake was that the RAM was a little bit out of place from the Motherboard. But it's a very similar case though and the Answer of the other question nicely puts that it's an interesting thing that the RAM was completely detected but nothing complained about its usability.
Best Answer
Your RAM is present but partly unusable.
This can happen if you have installed it in a socket configuration that is unacceptable to the motherboard, or even if a RAM stick is defective.
I suggest that you study well your motherboard manual as regarding RAM configurations.