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 the superior memory support and overall feature set offered by the winning motherboard.

Users prioritizing high-capacity memory configurations should select the Gigabyte B850 GAMING X to leverage its substantial advantage in that area. Conversely, the Gigabyte B660M DS3H DDR4 is the appropriate choice for budget-conscious builders, as it offers a 50% better MSRP. Choosing between these two components depends entirely on whether your primary requirement is maximizing system memory potential or minimizing the initial cost of your motherboard purchase.