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
Using Speccy to Understand What's Inside Your Computer | SPK and Associates
8GB Dual Channel DDR3 665Mhz RAM - HardverApró
HP Pavilion dv6-6c29tx CPU upgrade from 2.5GHz to 3.0GHz - Page 2 - HP Support Community - 7141018
Solved: Why is my new RAM running as DDR-1330 instead 1600? - Dell Community
motherboard - Why is my memory running at 665Mhz when the BIOS is clearly set to be higher? - Super User