Motherboard design is an iffy manufacturing issue. Not only are you trying to work with existing technology, but to keep up with the competition, new features have to be introduced to make the technology more cutting edge. Typically, the technology involves having more speed, lesser power consumption, faster processors, and technology that is more integrated. These are not small elements. Market share dominance can be the result of putting all of these elements together.
Before Intel introduced the 865g Motherboard, it had been reluctant to undertake some riskier technologies. It had a conservative bent. Its main competitor for the last several years has been AMD. However, it released the motherboard with an 800MHz front side bus. The 800MHz front side bus established a performance advantage over comparable chipsets.
It also introduced two channels of 64-bit DDR400 memory. The DDR400 or double data rate is a memory transfer mode for data on a computer bus. The rationale behind DDR400 became apparent from the designs of earlier chipsets. In order to avoid a performance penalty associated with clock synchronization, Intel had to develop a memory bus to function as a derivative of the system bus. This meant that the memory system was coordinated with the system bus, and not run independently of it.
Additional information about motherboards is available at How Motherboard Technology Has Evolved.