ASRock s BTC motherboards are equipped with six PCI expansion slots, so that miners may install up to six graphics cards to mine simultaneously. Maximize your chances of getting bitcoins now! http://www.asrock.com/mb/Intel/H81%20Pro%20BTC/ Besides adequate PCI expansion slots, ASRock s BTC motherboards also have two extra 4-pin power connectors for offering more power for your graphics cards. Never underestimate these two small power connectors that distinct ASRock s BTC motherboards from other fake mining motherboards! They provide stable voltages and greatly reduce the risks of burning your motherboard or graphics cards. Warning Please MUST install TWO PSU s 4-pin power cables to your MB s TWO 4-pin power connectors. Plug the 4-pin power connector closest to the PSU (1) to the 4-pin power connector closer to the PCIe slots (A). Then plug the 4-pin power connector which is second closest to the PSU (2) to the other 4-pin power connector (B). If your PSU only provides ONE, then please MUST install it to the 4-pin power connector closer to the PCIe slots. Important: Make sure both the connected 4-pin and 24-pin power connectors are on the same PSU; otherwise, the motherboard may be damaged.

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