: 2 x SATA 6Gb/s (SATA III) and often 2 x SATA 3Gb/s (SATA II) connectors. Rear I/O Ports
The Acer H81H3-AM V1.0 uses a or an Acer-modified AMI UEFI BIOS . Access it by pressing F2 or Del during boot. Acer H81h3-am V1.0 Manual
Do NOT connect ATX pins 1,2,4,6,19,20 (3.3V, -12V, +5V). The Acer board has no need for them. : 2 x SATA 6Gb/s (SATA III) and