Went from 2666Mhz ddr4 ram to 4000mhz ram and write speed is very low but read speed is good : r/overclocking
The Top 5 Best RAM For Heavy Duty Users | IFixScreens
16GB G.Skill DDR4 Trident Z Royal Silver 4000Mhz PC4-32000 CL18 Dual Kit 2x8GB – ASA College: Florida
TOUGHRAM Memory White DDR4 4000MHz 16GB (8GB x 2)
RAM: 16GB 3000MHz vs 3600MHz vs 4000MHz [ 9700K ]: 5 GAMES - YouTube
Thermaltake TOUGHRAM RGB White DDR4 4000MHz 16GB (8GB x 2) 16.8 Million Color RGB Alexa/Razer Chroma/5V Motherboard Syncable RGB Memory R022D408GX2-4000C19A at Amazon.com
G.SKILL TridentZ RGB Series 32GB (2 x 16GB) 288-Pin PC RAM DDR4 4000 (PC4 32000) Desktop Memory Model F4-4000C16D-32GTZR Desktop Memory - Newegg.com
3200MHz vs. 3600MHz vs. 4000MHz | Best RAM for Ryzen 5000? - YouTube