DDR6 is Four Times as Fast as DDR4 and Already in the Works

DDR SDRAM - Wikipedia

DDR4: Double the speed, double the latency?
Make sure your system can handle next-generation DRAM — Cadence Technical Article

DDR5 vs. DDR4 Memory: Is DDR5 worth the upgrade?

DDR4 (Double Data Rate 4) Definition

What is the difference between DDR3, DDR4, DDR5, and DDR6 RAM? - Quora

Why do we still use DDR4 for RAMs when GPUs are using GDDR5 for a long time and some even use GDDR6? - Quora

Reminder: DDR4 RAM Won't Fit Into DDR5 Slots and Vice Versa

DDR4 Design Masterclass - Zuken EN

DDR5 vs. DDR4: How Much Performance Will You Gain From Today's Newest RAM?