Re: The more they push
Motherboards came with CDs. After installing Windows you would install the software on the CD (which had appropriate sections for whichever Windows version it was) and various drivers and utilities appropriate to the chipset and CPU. In this way new features could be added to the base platform. For example Windows XX might have had no mechanism to monitor or control fan speed or CPU temperature but the software on the CD added this*.
This works to a certain degree for chipsets and other motherboard features, but it won't work for new CPU features, the whole OS needs to be recompiled to take advantage of new Opcodes.