Do you have all 4 RAM slots filled (you did not state the total RAM in the system)? If you have 2666 and 3200 installed in the system then all RAM will run at 2666.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
The other thing you need to post is the CPU model that's installed. The CPU is what controls the memory speed. Chances are high that a system which shipped with 2666 MHz RAM has a CPU that cannot run RAM at 3200 MHz -- meaning that the new RAM simply downclocks to match the memory controller (which is aboard the CPU) speed.
filbert
6 Operator
•
1846 Posts
498
1
Posted January 20th, 2023 10:00
According to Intel's specifications, that processor runs memory at maximum 2666 MHz.