This disassembling guide covers the following:
- Remove battery
- Removing back cover
- Removing hard drive
- Removing wireless card
- Removing memory
- Removing keyboard
- Power Cable Connector removal
- Casing removal
- Removing motherboard
- Cleaning processor fan
This Inspiron 5521 has 8 GB of memory (RAM), which is about average for a laptop, and it will be able to handle running several applications at once.