Question can i mix 2400mhz ram with 2666mhz ram in laptop? but there has no xmp option in bios although it is latest version

Apr 1, 2019
1
0
10
my laptop has 2 slot. one slot had 8gb ddr4l samsung ram with 2400mhz ram... recently i bought a 4gb ddr4l samsung ram but it is 2666mhz ram..rams part numbers= m471a5244cbo-ctd (2666mhz), m471a1k43cb1-crc(2400mhz). both have same voltage. when i put the stick, in task manager show 2666mhz..in cpuz it shows dual channel 12gb..but when i run user benchmark it says pls eneble xmp profile. although my laptop has latest bios version there is no such ai tweaker or xmp option.. so is it safe to run two Sticks?
user benchmark= https://www.userbenchmark.com/UserRun/15728235
is it ok or no?