Is it true that the difference between the "RAM" DDR3 and DDR4 in computers is just marketing?

Today, DDR4 RAM is eight years old - it was officially released on May 7, 2012,

when Micron showed off its first new type of memory module.

Since that time, working samples have been sentall partners, and a full-scale release was planned to begin in 2013. But in fact, the first desktop platform working with DDR4 was LGA2011-v3 with motherboards based on X99 Express logic and Haswell-E family CPUs. As a result, equipment suitable for use by DDR4 came out much later than the memory itself was ready - only on August 29, 2014. It is noteworthy that the JEDEC association began the development of the DDR4 standard back in 2005.