MSI PRO B660M-A WIFI DDR4 User Manual - Page 16

PCI_E1~3: PCIe Expansion Slots PCI_E1: PCIe 4.0 x16 (From CPU) PCI_E2: PCIe 3.0 x1 (From B660 chipset) PCI_E3: PCIe 3.0 x4 (From B660 chipset) ⚠⚠Important ∙∙If you install a large and heavy graphics card, you need to use a tool such as MSI Graphics Card Bolster to support its weight to prevent deformation of the slot. ∙∙For a single PCIe x16 expansion card installation with optimum performance, using the PCI_E1 slot is recommended. ∙∙When adding or removing expansion cards, always turn off the power supply and unplug the power supply power cable from the power outlet. Read the expansion card's documentation to check for any necessary additional hardware or software changes. JFP1, JFP2: Front Panel Connectors The JFP1 connector controls the power on, power reset, and the LEDs on your PC case/chassis. Power Switch/ Reset Switch headers allow you to connect power button/ reset button. Power LED header connects to LED light on the PC case, and HDD LED header indicates the activity of the hard disk. The JFP2 connector is for Buzzer and Speaker. To connect the cables from PC case to the right pins, please refer to the following images below. Power LED Power Switch Buzzer JFP1 2 1 HDD LED 10 9 Reserved Reset Switch JFP2 1 Speaker ⚠⚠Important Please note that Power LED and HDD LED have positive and negative connection, you need to link up the cable to the corresponding positive and negative port on the motherboard. Otherwise, LEDs won't work properly. 15