KTH81/Flex-ATX Motherboard with Intel®H81 Chipset and 4th Generation Intel® i7/i5/i3 Dual and Quad Core CPUs
This product is not recommended for new designs.
Due to the availability of the Audio Controller from this product, there are only a limited number of residual coverages possible. Please get in touch with your sales contact in advance.
Last time buy: 11.05.2020
Last time delivery: 10.08.2020
Replacement Product:
D3634-S mITX
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  • 4th Generation Intel® i7/i5/i3 Dual and Quad Core CPUs
  • Long term available Embedded Flex motherboard
  • High performance CPU, graphics and media performance supporting 3 independent display pipes
  • Graphics APIs DirectX 11.1, OpenGL 4.x, OpenCL 1.2
  • 3x Display Port for flexible, high resolution display drive
  • 1x 18/24bit dual link LVDS interface.
  • 4x DDR3L/DDR3 DIMM sockets supporting up to 32GB DDR3 Memory
  • PCIex16 (Gen3), PCIex4 (Gen2 in x16 slot) PCIex1 (Gen2)
  • 1x PCI rev 2.3
  • 6x SATA Gen3 with RAID functionality

Embedded Flex-ATX Motherboard with Intel®H81 Chipset and 4th Generation Intel® i7/i5/i3 Dual and Quad Core CPUs

Based on the latest Intel® 4th generation chipset, the Kontron KTH81/FLEX embedded motherboard with long-term availability offers engineers leading-edge embedded processing performance as well as up to 4K graphics in a compact ATX-compliant footprint. It provides a 35 percent increase in graphics performance compared to its predecessors and a higher floating-point performance as well as improved data en- and decryption while the thermal footprint has practically remained the same. With these improvements and with the long-term availability as well as the high-quality design, the Kontron KTH81/Flex sets a new benchmark for all mid-range to high-performance embedded applications in markets such as industrial automation, medical, gaming and digital signage.

With the Flex form factor engineers can immediately launch into developing system designs based on the broad, ATX-compliant ecosystem. The high-quality design of the Kontron embedded motherboards with features such as solid capacitors (POSCAP) additionally improves application reliability and availability in the field - even in the harshest of environments.

The Kontron KTH81/Flex embedded Flex motherboard is based on the Intel® H81 Express chipset and supports up to 32 gigabytes of DDR3 RAM. It can be equipped either with dual-core or quad-core 4th generation Intel® Core™ i3/i5/i7 processors with up to 3.1 GHz (3.9 GHz for Turbo Boost). For application-specific extension cards it offers one PCI Express x16 Gen 3.0 slot, one PCI Express x4 Gen2.0 (in x16 slot) and one PCI Express x1Gen 2.0. Further peripherals can be connected via four SuperSpeed USB (USB 3.0/2.0) and eight USB 2.0 ports.

The Kontron- specific embedded feature connector offers up to 160 GPIO, analog-to-digital converter (ADC) and digital-to-analog converter (DAC) minimizing the BOM and design-in efforts for individual I/O functionality. Complementary, Kontron offers the KT Evaluation Breakout Board, which further simplifies and accelerates system designs by providing direct access to features such as system monitoring, case-open sensing, thermal system management and much more via the feature connector. The embedded motherboard supports up to three independent hi-res displays or a 4K display which are connected via DisplayPort++. This enables direct connection of DisplayPort 1.2 panels and HDMI/DVI monitors with adapter cables. Board support one 18/24bit dual link LVDS interface. Besides the hi-res support, it also features hardware acceleration to dynamically improve video quality and it further supports stereoscopic 3D, adding another dimension to applications such as digital signage, gaming and entertainment. Two GbE LAN – one with Intel® AMT 9.0 – allow for extended networking options and out-of-band management, minimizing the need for on-site maintenance. A wide range of storage media can be connected via six SATA interfaces with 1.5/3/6 Gbit/s and RAID 0/1/5/10 functionality . HD audio, two COM ports and a Trusted Platform Module 1.2 for safety-related applications top off the feature set of the new motherboards.

The boards supports Windows 7 and 8, Windows Embedded Standard 7 and 8, VxWorks, as well as several Linux distributions (Red Hat Enterprise, Novell SuSE Linux Enterprise, Red Flag Linux and Wind River Linux, among others).

Also take a look on our KTQ87/Flex!


Form Factor Flex 229 x 191 mm (7.5" x 9.0")
CPU Intel® Core i7/i5/i3 2C/4C CPU clock up to 3.1 GHz
Graphics Integrated into CPU with GT1 or GT2 depending on CPU type
Main Memory Up to 8 GByte DDR3L/DDR3, 4x DIMM (max. 32 GByte), PC3-10600/PC3-12800 support
Chipset Intel® Embedded Q87
SATA 6x SATA interfaces SATA 1.5/3/6 Gbit/s w. RAID 0/1/5/10
USB 4x USB 3.0 & 8 USB 2.0. (4x USB3.0/USB2.0 Rear IO, 8x USB2.0 Internal Header
Audio HD Audio codec VT1708S supporting 7.1 channel surround sound
Ethernet 2x Intel Gigabit-LAN, one LAN controller supporting Intel® AMT 9.0
Available I/Os PCIe x16 socket with Gen3 and Gen2 support, 1x x4 PCIe, 1x x1 PCIe, 1x PCI rev 2.3, 2x COM (RS232)
Rear I/O Audio stacked 2x 3 mini Jack tower, 4x USB, 3x DisplayPort, 2x RJ45 LAN
Special Features AMT 9.0, TPM 1.2, Intel® AES security, Kontron embedded feature connector with ADC, DAC up to 160 GPIOs
Temperature Operating 0 °C to 60 °C (32 °F to 140 °F)
Additional Up to 7 years availability



KTQ87/FLEX Datasheet
[ ktq87-flex_20180717_datasheet.pdf, 1.54 MB, Jul.17.2018 ]

KTH81/Flex Datasheet
[ kth81-flex_20180717_datasheet.pdf, 1.67 MB, Jul.17.2018 ]


KTQ87 KTH81 Users Guide
Rev. P Oct 07, 2019
[ ktq87---kth81_user-guide_rev-p_2019_10_07.pdf, 5.31 MB, Oct.07.2019 ]

General Safety Instruction
[ general-safety-instructions.pdf, 560.72 KB, Jan.04.2021 ]

Mechanical Drawings

KTQ87-Flex 2D Drawing in PDF
[ ktq87-flex-2d-drawing-20131112.pdf, 245.1 KB, May.28.2014 ]

Tech Spec Sheet

Motherboard and SMARTCASE™ Tech Specs
[ tech-specs_motherboards-and-smartcase.pdf, 2.57 MB, Jul.28.2021 ]


Kontron Services Brochure
[ kontron-services-brochure.pdf, 8.9 MB, Dec.17.2020 ]

More Downloads

All other downloads such as drivers, bios, drawings etc. are available on Kontron’s Customer Section


KTH81/Flex KTH81/Flex-ATX Motherboard with Intel®H81 Chipset and 4th Generation Intel® i7/i5/i3 Dual and Quad Core CPUs  
Intel Core i3-4330
Intel Core i3-4330 Intel Core i3-4330 GT2 3.5GHz, 3C 4MB, 54W, LGA1150  
Intel Core i5-4570S
Intel Core i5-4570S Intel Core i5-4570S, 3.60 GHz, quad Core, 6MB Cache, 65W, FCLGA1150, Embedded  
Intel Core i7-4770S
Intel Core i7-4770S Intel Core i7-4770S, 3.90 GHz, quad Core, 8MB Cache, 65W, FCLGA1150, Embedded  
Intel® Celeron-G1820TE
Intel® Celeron-G1820TE Intel® Celeron-G1820TE GT1 2.2GHz, 35W  
Intel Pentium-3420
Intel Pentium-3420 Intel Pentium-3420 GT1 3.2GHz, 2C 3MB, 54W, LGA1150  


DDR3, 1GB, 1600MHZ
DDR3, 1GB, 1600MHZ DDR3, 1GB, 240P, 1600MHZ, PC3-12800 DIMM  
DDR3-1600 DIMM 2GB
DDR3-1600 DIMM 2GB DDR3, 2GB, 240P, 1600MHZ, PC3-12800 DIMM  
DDR3-1600 DIMM 4GB
DDR3-1600 DIMM 4GB DDR3, 4GB, 240P, 1600MHZ, PC3-12800 DIMM  
DDR3-1600 DIMM 8GB
DDR3-1600 DIMM 8GB DDR3, 8GB, 240p, 1600MHZ, PC3-12800 DIMM  
Active Cooler for Socket H2 (LGA1155) ZIF Socket CPU
Active Cooler for Socket H2 (LGA1155) ZIF Socket CPU Active Cooler for KTQ67 / KTQ77 / KTQ87 / KTH81/ more
Cable COM2 100mm Bracket
Cable COM2 100mm Bracket Cable COM2 100mm Bracket more
LVDS Connector for cable
LVDS Connector for cable LVDS Connector for cable more


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