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(Note 2) To use the onboard D-Sub, DVI-D, HDMI, and DisplayPortj ports, you must install an Intel CPU with integrated graphics. (Note 3) The DVI-D port does not support D-Sub connection by adapter. (Note 4) You can use only one of the onboard digital graphics ports (e.g. DisplayPortj, HDMI, and DVI-D) for output when in the BIOS Setup program or when during the POST screens. (Note 5) For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot. (Note 6) The PCIEX16 slot operates at up to x4 mode when ATI CrossFireX™ is enabled. (Note 7) Whether the CPU/system fan speed control function is supported will depend on the CPU/system cooler you install. (Note 8) Available functions in EasyTune may differ by motherboard model. j Only for GA-H55M-UD2H 1-3 Installing the CPU and CPU Cooler Read the following guidelines before you begin to install the CPU: • Make sure that the motherboard supports the CPU. (Go to GIGABYTE's website for the latest CPU support list.) • Always turn off the computer and unplug the power cord from the power outlet before installing the CPU to prevent hardware damage. • Locate the pin one of the CPU. The CPU cannot be inserted if oriented incorrectly. (Or you may locate the notches on both sides of the CPU and alignment keys on the CPU socket.) • Apply an even and thin layer of thermal grease on the surface of the CPU. • Do not turn on the computer if the CPU cooler is not installed, otherwise overheating and damage of the CPU may occur. • Set the CPU host frequency in accordance with the CPU specifications. It is not recommended that the system bus frequency be set beyond hardware specifications since it does not meet the standard requirements for the peripherals. If you wish to set the frequency beyond the standard specifications, please do so according to your hardware specifications including the CPU, graphics card, memory, hard drive, etc. 1-3-1 Installing the CPU A. Locate the alignment keys on the motherboard CPU socket and the notches on the CPU. LGA1156 CPU Socket Alignment Key Alignment Key Pin One Corner of the CPU Socket LGA1156 CPU Notch Notch Triangle Pin One Marking on the CPU B. Follow the steps below to correctly install the CPU into the motherboard CPU socket. Before installing the CPU, make sure to turn off the computer and unplug the power cord from the power outlet to prevent damage to the CPU. Step 2: Remove the CPU socket cover as shown. Hold your index finger down on the rear grip of the socket cover and use your thumb to lift up the front edge (next to the "REMOVE" mark) and then remove the cover. (DO NOT touch socket contacts. To protect the CPU socket, always replace the protective socket cover when the CPU is not installed.) Step 1: Gently press the CPU socket lever handle down and away from the socket with your finger. Then completely lift the CPU socket lever and the metal load plate will be lifted as well. Step 3: Hold the CPU with your thumb and index fingers. Align the CPU pin one marking (triangle) with the pin one corner of the CPU socket (or you may align the CPU notches with the socket alignment keys) and gently insert the CPU into position. Step 4: Once the CPU is properly inserted, use one hand to hold the socket lever and use the other to lightly replace the load plate. When replacing the load plate, make sure the front end of the load plate is under the shoulder screw. Step 5: Push the CPU socket lever back into its locked position. NOTE: Hold the CPU socket lever by the handle, not the lever base portion. 1-3-2 Installing the CPU Cooler Follow the steps below to correctly install the CPU cooler on the motherboard. (The following procedure uses Intel® boxed cooler as the example cooler.) Male Push Pin Direction of the Arrow Sign on the Male Push Pin The Top of Female Push Pin Female Push Pin Step 1: Apply an even and thin layer of thermal grease on the surface of the installed CPU. Step 2: Before installing the cooler, note the direction of the arrow signon the male push pin. (Turning the push pin along the direction of arrow is to remove the cooler, on the contrary, is to install.) Step 3: Place the cooler atop the CPU, aligning the four push pins through the pin holes on the motherboard. Push down on the push pins diagonally. Step 4: You should hear a "click" when pushing down each push pin. Check that the Male and Female push pins are joined closely. (Refer to your CPU cooler installation manual for instructions on installing the cooler.) Step 6: Finally, attach the power connector of the CPU cooler to the CPU fan header (CPU_FAN) on the motherboard. Step 5: After the installation, check the back of the motherboard. If the push pin is inserted as the picture above shows, the installation is complete. Use extreme care when removing the CPU cooler because the thermal grease/tape between the CPU cooler and CPU may adhere to the CPU. Inadequately removing the CPU cooler may damage the CP...