Hi,
I just bought a X509-FJ from ASUS and when I open it (I need to upgrade the RAM and the SSD because this is the HDD+MX230 ver.) i found a empty slot of RAM
I was quite surprise that the only slot of RAM I able to see is blank, and when I launch the laptop, it runs perfectly fine, and it receive that there is 4GB RAM is usable
So I just wonder where is the 'default' 4GB pre-installed RAM slot