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Samsung H61s1 Manual __full__ -

jumper or removing the CMOS battery for 30 seconds while the power is unplugged. Power Connectors : Ensure both the 24-pin ATX main power and the 4-pin (or 8-pin) CPU

The manual emphasizes:

1 x PCI Express 3.0/2.0 x16 slot for dedicated graphics cards. samsung h61s1 manual