When did ddr4 RAM come out?

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4. What is ddr4 Sdram 8gb?
5. Which RAM is better ddr4 or ddr5?
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Tags

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2. #installment
3. #speeds
4. #generation
5. #double
6. #supports
7. #released
8. #second
9. #predecessor
10. #transfers
11. #years
12. #since
13. #dynamic
14. #fourth
15. #before
16. #latest
17. #short
18. #development