| Feature | Standard H81 (Retail) | Acer H81H3-AM V1.0 | | :--- | :--- | :--- | | | mATX (244x244mm) | mATX (244x203mm – truncated width) | | CPU Power | 4-pin ATX12V | 4-pin (but 12V pins reversed on some revs) | | Main Power | 24-pin ATX | 12-pin custom (Pinout: 12V, GND, 5VSB, PS_ON, PWR_OK) | | PCIe x16 | Gen 2.0 (from H81) | Gen 2.0 (but physically x16, electrically x4 on second slot) | | BIOS | 8MB SPI | 16MB SPI (contains DMI/SMBIOS locked to Acer) |
| Acer Pin | Signal | ATX Pin | Wire Color (ATX) | | :--- | :--- | :--- | :--- | | 1 | +12V | 10 | Yellow | | 2 | +12V | 11 | Yellow | | 3 | GND | 3 | Black | | 4 | GND | 5 | Black | | 5 | GND | 7 | Black | | 6 | GND | 13 | Black | | 7 | +5VSB | 9 | Purple | | 8 | (NC) | - | - | | 9 | +5VSB (duplicate) | 9 | Purple | | 10 | PS_ON# | 16 | Green | | 11 | (NC) | - | - | | 12 | PWR_OK | 8 | Gray | Acer H81h3-am V1.0 Manual
Users have successfully tested the i7-4790 on updated BIOS versions of this board. | Feature | Standard H81 (Retail) | Acer H81H3-AM V1