If you cannot open the case (e.g., a work laptop or sealed pre-built like Dell/HP), you can estimate your required wattage based on your components. This tells you what PSU you should have.
| Method | Accuracy | Difficulty | Best For | | :--- | :--- | :--- | :--- | | | High | Easy | Pre-built PCs (Dell, HP) | | Physical Label | 100% Accurate | Medium | Custom builds & Gaming PCs | | Software | Low/Medium | Easy | High-end "Smart" PSUs only | | Order History | High | Easy | If you have the receipt | how to check your pc power supply wattage
on sites like Newegg, Amazon, or Micro Center to view your past orders. 3. Use Third-Party Software (Estimations Only) If you cannot open the case (e