Lenovo Legion Y530 (memory issues)

[Yuusha]

hello guys i wouldlike to thanks everyone that help picked a laptop

and  the pc i got is the lenovo legion y530

cpu i5 8300H 2.3ghz 630uhd

ram 8gb ram (1/2)

gpu Nvidia gtx 1050

1tb HDD

and im actually having some issues with my ram i have a 8gb stick running on one channel (the other one is unpopulated)

and when i boot to windows it only detects 6.15GB out of the 8GB

i know about the sharedmemory between  the uhd630 and the rams but there is a secret bios on the legion where i can config that  and the lowest i can get  is at 128MB on the dvmt settings and on the shader setting

i did get some rams back but its a mere 6.40gb so 250mb freed  and i dont know whats using all that 1.5gb ram on it

https://valid.x86.fr/jxuae4