The Gigabyte Z890 AORUS MASTER is the objective winner, securing victory in ten out of thirteen comparable specifications. Its most significant advantage is its maximum memory capacity, which is 300% higher than that of the alternative. While the Gigabyte B660M DS3H DDR4 holds a single spec advantage, the superior memory ceiling and overall technical lead make the Z890 AORUS MASTER the more robust hardware solution for users requiring extensive system resources.

Choose the Gigabyte Z890 AORUS MASTER if your primary requirement is high-capacity memory support for demanding workloads. Conversely, the Gigabyte B660M DS3H DDR4 is the appropriate selection for budget-conscious builders who prioritize a lower MSRP over the advanced memory capabilities and broader feature set found in the higher-tier model. Select the board that aligns with your specific memory needs and financial constraints to ensure the best fit for your build.