Comment by noboostforyou
2 days ago
The "best" depends on what you want. For example, with desktop memory the previous DDR4 gen Samsung's B-die was considered the top choice if you wanted the fastest speeds and highest overclocking potential. Micron's rev-e die was also desirable as it was usually dual rank (technically slower, but for certain real world applications you will get better performance) and also overclocked quite well.
Now with DDR5, Hynix's A-die is considered the best option.
Dual rank was a lot faster in DDR4 days IIRC, because it allowed a memory channel to have more requests in-flight on the memory - it could be worth like +10% performance or more.
Less impactful in DDR5 because they made it a design goal to have more "ranks" by default, though it does still have a small performance benefit.