Wow thats a big one,
Do you mean actual Intel motherboards, or just motherboards with Intel chiopset?
Nobody sells Intel motherboards anymore, are they still making them?
I will only say this:
For the last few years, Intel chipsets has either been made to force you to pay extra for new features, or if you wanted a cheaper version, they have deliberately hampered it.
Just to force the market into a high and low end section. Some of the best examples are I820 and i840, when people discovered they were too expensive and slow, Intel made I815, but I815 is limited to only 512MB RAM!
Also Intel changes socket all the time, again to differentiate high and low end markets. This is seen a lot with more generations of Celeron and Pentium motherboards.
---
Engage!