You don't "understand the implications and how memory works" you and Caracus2k are unable to explain why you are even making an issue out of this.
Caracus2k own link clearly show there is no real world difference with 400Mhz Memory speed differences.
All the pair of you are doing is repeating your failed and already disproved blanket statements over and over and over again......
It probably is something worth discussing. Just in better company