The Gigabyte GA-H81TN (Rev. 1.0) is a Thin Mini-ITX motherboard based on the Intel H81 Express chipset (Lynx Point), released around 2013–2014. It is designed for compact, slim-profile PCs such as All-in-One (AIO) systems, small form factor builds, industrial/embedded applications, or slim desktop cases. gigabyte.comKey Features

• Form Factor: Thin Mini-ITX (170mm × 170mm) — about 43% thinner than standard Mini-ITX, with specialized power and display features for slim designs. gigabyte.com
• CPU Support: LGA 1150 socket for 4th-generation Intel Core (Haswell) processors — Core i7/i5/i3, Pentium, and Celeron (up to 84W TDP recommended). Higher TDP CPUs may need a stronger power adapter. gigabyte.com
• Memory: 2× DDR3 SO-DIMM slots (dual-channel), up to 16 GB, supporting 1600/1333 MHz modules. gigabyte.com
• Graphics: Integrated Intel HD Graphics with:
  • 1× HDMI 1.4a (up to 4096×2160)
  • 1× DisplayPort (up to 2560×1600)
  • 1× LVDS connector (for internal panels) gigabyte.com
• Expansion:
  • 1× PCIe x4 slot (PCIe 3.0, up to 25W, often used with riser cards for TV tuners, capture cards, etc.)
  • 1× Mini PCIe slot gigabyte.com
• Storage: 2× SATA 6 Gb/s, 1× SATA 3 Gb/s, 1× mSATA 3 Gb/s. gigabyte.com
• Connectivity:
  • Rear: 2× USB 3.0, 2× USB 2.0, GbE LAN (Realtek), HDMI, DisplayPort, audio jacks, DC-in power.
  • Internal: Multiple USB 2.0 headers, serial/parallel ports, fan headers, LVDS/backlight power options. gigabyte.com
• Audio: Realtek ALC887 (HD Audio, up to 7.1-channel with front panel module). gigabyte.com
• Power: Wide-range DC input (12–19V), with recommendations for 150W or 180W adapters depending on CPU TDP. Special connectors for panel/backlight power (selectable 3.3V/5V and 12V/19V). gigabyte.com

Unique Thin Mini-ITX Design Elements

• Selectable panel driver power (3.3V/5V jumper) and backlight power (12V/19V) for better compatibility with various LVDS displays. gigabyte.com
• Focused on low-profile, power-efficient builds with features like all-solid capacitors for reliability. gigabyte.com

Use CasesThis board was popular for custom slim PCs, digital signage, kiosks, or retro/small-form-factor builds. It's now considered legacy hardware, best for light tasks, media centers, or older gaming/emulation where a compact footprint is needed. It supports Windows 7/8 natively; modern OSes like Windows 10/11 may work with drivers but lack official support. gigabyte.comOfficial Gigabyte pages and manuals are still available for specs, BIOS updates, and driver downloads. Variants like GA-B85TN, GA-H87TN exist in the same Thin Mini-ITX family.