So I just got a new laptop with 1 RAM slot empty and 1 4GB RAM soldered to motherboard. The maximum amount memory supported by the motherboard is 12GB. So I can either buy another 4GB stick and make it 8 GB or maxed out the memory to 12 GB by buying an 8 GB stick. In my country the price for 4GB ddr4 sodimm memory is around 40$ and the price for 8 GB is around 61$. So what should I buy?