Not likely.
Ram must all be run at the same speed, cas and voltage.
You might be looking at the individual ram specs in which case you were lucky to get them to run together.
Run cpu-z.
On the memory tab you will see the speed at which they are working, the voltage and cas numbers.
Note that because of dual channel, the actual speeds will be double what you see.
On the spd tab, you can see what is installed in each slot. as well as the possible xmp settings.
You might want to run memtest86 to test the ram.
You should be able to do a full pass with NO errors.