Hello friends. Compliments to each and everyone.I have a Sony VAIO VGCRT100Y and noticed there isn't any memory modules in the slots but it says it's 4GB RAM. Is the 4GB built into the motherboard? Also, I would like to know whether the slots are only for additional RAM? Hoping to see some nice replies people. Thanks in advance for the help as I really appreciate it on a very high note. Take Care.