Is there a reason you are buying 2400 MHz DDR4 when you're CPU only supports 2133 MHz?
Probably missed this one. Didn't know CPU's had issues with Ram compatibility. Both Pentium and i5 support 2133Mhz? Anyway that's not a big fuck up. Ram will work at 2133Mhz mode then.
I think the question is suggesting you could get cheaper RAM if it was 2133 instead of 2400 since 2133 is as fast as it will run anyway.