Have you been reading the Intel architectural documents again?!
I can only guess that you're referring to the Intel documentation that
speaks about the MCH (Memory Controller Hub), which is nothing you have to
be concerned about, it's simply an architectural element of the motherboard
design (Northbridge to be precise). It's not something you *do* something
to, anymore than you *do* something to the IDE controllers, for example.
It's just there.
You're a little do far down in the trees, at least for the initial phase of
motherboard research, you need take a few steps *back* and consider your
options wrt CPU (Intel vs. AMD), chipset (Intel, VIA, Sis, NForce2), memory
(PC2700, PC3200), Parallel vs. Serial ATA drives, sound, video, etc. These
represent the *choices* you'll be making. If you go w/ say an Intel 865
motherboard, well..., then you'll inherit the Intel 865 architecture, which
includes that wonderful MCH. But again, it's just an architectural element,
you don't anything to it!