Windows 10 shows less memory that I have.

[animationbruno]

I have a P6X58D-E Asus Motherboard. I just put 6 memory cards of 4gb to have 24gb in total. Speccy shows 24gb. But Windows 10 only shows 8gb of total ram. Why this is happening ?

 

[camieabz]

http://www.tomshardware.co.uk/answers/id-3123587/shows-8gb-ram-16gb.html#18287116