512MB cards that total 1GB, or if the laptop all ready has 1 512MB, you would purchase an additional 1 512MB card to make a total of 1GB.
The types of Memory used in laptops are SDRAM (Single data rate t https://78winz.net/ Synchronous RAM), SODIMM (Small Outline Dual Inline Memory Module), DDR SDRAM (Dual Data Rate Synchronous RAM) or memory modules that are proprietary. Again, make sure to check your laptop manual to see which one you need. Most retailers of laptop memory have wizards that let you select your laptop brand and model and provide you with the correct memory model.
The memory cards are inserted into assigned slots in the laptops; usually there is a minimum of two slots for extra memory on laptops. Again, make sure to check the manual to make sure how many slots you have open and the capacity of those.
Installing Laptop Memory Tips
1. Take care when handling the memory card.
2. Power off the laptop when installing memory
3. For accessing the memory modules easily, some laptops have removable panels at the bottom.
4. Use a screwdriver to open the panel.
5. The memory modules are seated in the slots and locked with small clips at the strip ends. If you are swapping out an existing memory card then remove the existing memory by pulling the memory modules gently after unlocking the strip clips. If you are adding a memory card then just locate the empty slot.