Upgrading my Asus ultrabook RAM

I have ASUS zenbook UX32VD (i5 version) and it only has 4GB of RAM preinstalled and while I originally thought that it has two RAM expansion slots it tued out it doesn't! So as I am on LINUX I used an lshw application to check this out and this is what it tued out:

Program shows me that it still has an extra slot while I can't physically see it. Weird. Also 4GB of RAM are divided among two containers and I suspect that 2GB of RAM is solderd on the motherboard while 2GB resides in my expansion slot. The other expansion slot is somehow nonexistent...

Can anyone confirm this and suggest me the best RAM I can buy to maximize my laptop RAM. Is it true that the max ammount of ram this motherboard detects is only 8GB?

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