Hello, i've bought a vostro 3568 with i7 processor for a couple of months, and the thing is that it only have 4gb of ram. I want to put one more 8gb stick in it but a technical professor told me that the maximum memory that is supported for my laptop is only 8gb although everywhere else says 16. Please tell me if i could upgrade ram to 12gb.

sr for my bad english, i'm not a native

kindly guide me, thank you !!!