ASUS B250 Mining Expert is the world’s first mining motherboard to feature 19 PCI Express ® (PCIe ®) slots . With 18 PCIe x1 and one PCIe x16 slots on board, plus three zoned ATX12V power connectors, B250 Mining Expert lets you run up to 19 NVIDIA or AMD GPUs* in parallel to max out your megahash rates!