English Manual.
Page 15
... notches on the CPU. If you begin to your hardware specifications including the CPU, graphics card, memory, hard drive, etc. LGA1156 CPU Socket Alignment Key Pin-1 corner of the CPU Socket LGA1156 CPU Notch Pin-1 triangle marking of the CPU may locate the notches on both sides of the CPU and alignment...
... notches on the CPU. If you begin to your hardware specifications including the CPU, graphics card, memory, hard drive, etc. LGA1156 CPU Socket Alignment Key Pin-1 corner of the CPU Socket LGA1156 CPU Notch Pin-1 triangle marking of the CPU may locate the notches on both sides of the CPU and alignment...