My laptop (Samsung NP300E5V) has two slots for RAM and is running on Win8 x64. There's a 4 GB stick in one slot (1600 mhz DDR3), which means the second slot is free. Total capacity is 8 GB. The brand of the current ram is ADATA. I got a HYNIX 4 GB ram (since adata wasnt available) which is of...