Keby nebol dopyt tak by analogicky ani v minulosti nebola ponuka po takýchto combo doskách
DDR & DDR2
DDR2 & DDR3
https://www.gigabyte.com/webpage/8/article_09_p35c.htm
https://www.amazon.in/MSI-G41M-COMBO-Motherboard-Slots/dp/B00ABUWYTE
DDR3 & DDR4
https://www.eteknix.com/asrock-releases-dual-ddr3ddr4-b150m-combo-g-motherboard/