The Gigabyte B850I AORUS PRO is the objective winner of this comparison, securing more individual specification victories than the Gigabyte B660M DS3H DDR4. While both motherboards share several identical features, the Gigabyte B850I AORUS PRO provides the most significant technical advantage by offering 100% more maximum memory capacity. This substantial increase in supported RAM headroom serves as the primary differentiator between the two boards, establishing the former as the superior option for memory-intensive workloads.

Users requiring extensive storage connectivity should select the Gigabyte B660M DS3H DDR4, as it provides 100% more SATA ports than its competitor. Conversely, those prioritizing system scalability and high-capacity memory configurations should choose the Gigabyte B850I AORUS PRO. By aligning your specific needs for either drive expansion or memory overhead with these distinct advantages, you can ensure the selected motherboard effectively supports your intended hardware setup and long-term usage requirements.