The Gigabyte B850 GAMING X is the objective winner of this comparison, securing victory in eight out of thirteen evaluated specifications. Its most significant technical advantage is its maximum memory capacity, which is 300% higher than that of the alternative. While the Gigabyte B660M DS3H DDR4 holds its own in four categories, it falls behind in overall feature density, despite offering a 50% better MSRP compared to the winning board.

Users prioritizing high-capacity memory configurations should choose the Gigabyte B850 GAMING X to leverage its superior support for system RAM. Conversely, the Gigabyte B660M DS3H DDR4 is the logical selection for budget-conscious builders who prioritize a lower MSRP over the expanded memory headroom provided by the higher-tier model. Selecting between these two motherboards depends entirely on whether your build requires maximum memory expansion or a more accessible entry price.