The Intel Arc A580 and the NVIDIA RTX 3090 reach an objective tie, as each component leads in seven distinct specification categories. The most impactful advantage for the Intel Arc A580 is its AV1 Encoding capability, which represents a 100% improvement over the alternative. Conversely, the NVIDIA RTX 3090 holds a significant lead in raw processing power, boasting a 242% advantage in shader units compared to the Intel offering.

Users prioritizing advanced media workflows and modern encoding standards should select the Intel Arc A580 for its superior AV1 support. Those who require maximum computational throughput for intensive rendering or complex graphical tasks should choose the NVIDIA RTX 3090, as its vastly higher shader unit count provides a clear hardware edge for those specific operations. Your final decision depends entirely on whether your primary workload favors encoding efficiency or raw shader performance.