[NAME] The specs of your Silicon Power RAM are not detailed enough to know for sure, but my guess is that the speed (3200 MHz) is the XMP (EXtreme Memory Profile) speed but Dell motherboards are not capable of using XMP. Dell motherboards depend upon the SPD (Serial Presence Detect) speed and that speed for your RAM is most likely 2666 MHz. Many RAM manufacturers advertise the XMP speed because it is higher; you should look for the SPD speed. Crucial memory usually advertises the SPD speed. 
Thank you for any clarity you can offer around this issue. My system is running an i7-11700K.  Came with 16GB RAM which ran at 2933. I just sprang for some cheap RAM - Silicon Power Gaming Series DDR4 32GB (16GBx2) rated at 3200MHz: [URL]  I pulled the old RAM out and installed the two new sticks in the same slots as the old RAM.  After boot, the system reported the new memory running at 2666 instead of 2966.  I powered down and installed the memory in the other paired slots - exact same result. Any advice or guidance?  Is this a compatibility issue with this vendor's memory? I appreciate your insights!
RAM running at 2666 on i7 processor - help?