The Gigabyte X870E AORUS MASTER is the objective winner of this comparison, securing victory in nine out of fourteen evaluated specifications. Its most significant advantage over the Gigabyte B550 AORUS PRO AC is its maximum memory capacity, which is 100% higher. While the Gigabyte B550 AORUS PRO AC holds a 100% advantage in the number of PCIe x1 slots, the overall feature set and technical capabilities of the Gigabyte X870E AORUS MASTER make it the superior choice.

Users who require the highest possible memory capacity for demanding workloads should choose the Gigabyte X870E AORUS MASTER to take advantage of its superior support. Conversely, the Gigabyte B550 AORUS PRO AC remains the preferred option for builders who specifically prioritize a higher count of PCIe x1 slots for their expansion needs. Selecting between these two motherboards depends entirely on whether your system configuration relies on memory density or additional PCIe connectivity.