Which is better upgrade RAM or SSD?

Related questions

1. Is 4gb Sdram enough?
2. How does Sdram differ from ordinary DRAM?
3. Is 8gb RAM fast?
4. Can I put 8gb and 4gb RAM?
5. Why Sdram is faster than DRAM?
6. Is DIMM ddr4?
7. What is faster than RAM?
8. Is ddr4 better than SSD?
9. Is static RAM faster than dynamic RAM?
10. What is computer Sdram?

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