Solved. Corsair DDR4 2666MHz DRAM Frequency reported as 665.1 MHz in CPU-Z? | PCSPECIALIST
Tech-America.com
DDR4 DRAM not correct - Troubleshooting - Linus Tech Tips
CPU Z says dram as 665mhz only but i have installed 2666mhz DDR4 (so it should show 1333mhz) - Dell Community
Inspiron 5570 Ram Speed Issue? - Dell Community
Windows 10 Help Forums
motherboard - Why is my memory running at 665Mhz when the BIOS is clearly set to be higher? - Super User
Crucial Ballistix Gaming Memory HTML Page (EN) | Crucial.com
Why Task Manager shows 1333 Mhz and not 2666 Mhz despite adding 2*2GB 1333 Mhz (DDR3 KIT) and CPU-Z shows Dual Channel & DRAM Frequency at 665 Mhz? - Quora