z77 slotZ77 Pro3 · 100% All Solid Capacitor Desn · Di Power Desn · Supports Dual Channel DDR3 2800+(OC) · 1 PCIe 3.0 x16, Supports AMD Quad CrossFireX™ and CrossFireXMotherboard Gaming ASRock Z77 Extreme 4 LGA1155 B75 H61. 4