RAM Price Report: DDR4 Same Price as Initial Launch | GamersNexus - Gaming PC Builds & Hardware Benchmarks
G.SKILL Trident Z Royal Elite Releases with High Performance CL14 Low-Latency Kits Up To DDR4-4000 32GB (16GBx2) - G.SKILL International Enterprise Co., Ltd.
DDR4 memory in Works, Will reach 4.266GHz.
The Evolution of DDR SDRAM | Integral Memory
DDR4 vs. DDR5: How Do They Compare? - History-Computer
Reminder: DDR4 RAM Won't Fit Into DDR5 Slots and Vice Versa | PCMag