I can't find anything to support your statement MG23. All the information I have seen, and the experience and documentation that was supplied with the dozens of machines I work with at the moment, tell me:
Multi-channel memory architecture is a feature of the MOTHERBOARD.
Dual, triple and quad channel motherboards will only work in those multi-channel modes, when the memory is in sets of 2, 3 or 4 respectively, and if the modules in each set match in capacity and performance characteristics. The moment you introduce a non-matching module into the memory set, the whole lot is reduced to running in single channel mode to all modules.