The ASRock X870 Steel Legend WiFi is the objective winner of this comparison, securing a higher number of superior specifications across the evaluated fields. Its most impactful advantage is a 100% increase in maximum memory capacity compared to the ASRock H670 Steel Legend. While both motherboards share several identical features, the X870 model provides a significant edge in total system memory support, which serves as the primary differentiator in this technical assessment.

Users prioritizing high-capacity memory configurations should select the ASRock X870 Steel Legend WiFi for its expanded support. Conversely, the ASRock H670 Steel Legend is the better choice for those who specifically require additional expansion connectivity, as it offers a 100% advantage in the number of available PCIe x1 slots. Your decision should depend on whether your build demands greater total system memory or a higher quantity of PCIe x1 expansion options.