I have Sony Vaio SVS13136PGB and I want to upgrade its memory from 4 GB to 12 GB. I have tried using this website, but I could not find my model there. The closest ones are SVS13137PGB and SVS13136PAB, yet I am not sure if it's safe to assume that these two can best represent the model I have. Can somebody help me? Also, I am interested to know whether I only need to add an additional 8 GB (i.e. if there is a free slot) or buy a whole 12 Gb.