I have a dell optiplex motherboard and the supported ram in the motherboard is rated up to 1333mhz and I put 1666mhz ram into it. I checked task manager and it showed the the ram was under clocking at 1067mhz only. Is there a way to change the clock speed of memory for dell optiplex computers? I tried accessing the dell optiplex bios and it’s pretty restrictive so I can’t really change any settings.