The XU4 is fully software compatible with XU3!
However, the XU4 is more compact, more affordable and more expandable.

* Samsung Exynos5422 Cortex™-A15 2Ghz and Cortex™-A7 Octa core CPUs
* Mali-T628 MP6(OpenGL ES 3.0/2.0/1.1 and OpenCL 1.1 Full profile)
* 2Gbyte LPDDR3 RAM PoP stacked
* eMMC5.0 HS400 Flash Storage
* 2 x USB 3.0 Host, 1 x USB 2.0 Host
* Gigabit Ethernet port
* HDMI 1.4a for display
* Size : 82 x 58 x 22 mm approx.(including cooling fan)

User Manual is available.
http://magazine.odroid.com/odroid-xu4/

A MicroSD card or an eMMC module is required to boot the OS. We strongly recommend an eMMC module for faster OS booting, quicker application launching, seamless multi-tasking and efficient access to the cloud.

NOTE:
1. The active cooling fan is mounted on the XU4 board by default. It spins only when the CPU load is high and the temperature of the CPU hits a minimum threshold temperature. Like most fans, a slight hum can be expected when active.

WIKI : http://odroid.com/dokuwiki/doku.php?id=en:odroid-xu4 SCHEMATICS : http://dn.odroid.com/5422/ODROID-XU4/Schematics/ PCB mechanical drawings (AutoCAD format) :  http://dn.odroid.com/homebackup/XU4_MAIN_REV0.1_DXF.DXF Official Case Design File : http://www.hardkernel.com/main/products/prdt_info.php?g_code=G143522987777  Certificates : http://odroid.com/dokuwiki/doku.php?id=en:xu4_hardware#compliance_archives

BLOCK DIAGRAM

XU4 is fully software compatible with XU3 ! But XU4 is more compact, more affordable and more expandable. What's different from XU3. Pros - Gbit Ethernet - More Stable Dual USB 3.0 host ports - More compact PCB size - More IO ports (I2S/I2C/GPIO) Cons - No USB OTG - No DP - No Audio CODEC - No Power Monitoring Sensors BOARD DETAIL

PCB DETAIL

CPU Samsung Exynos-5422 : Cortex™-A15 and Cortex™-A7 big.LITTLE processor with 2GByte LPDDR3 RAM eMMC 5.0 module(Option) 16GB/32GB : Sandisk iNAND Extreme 64GB : Toshiba eMMC PMIC Samsung S2MPS11 9 high-efficiency Buck, 1 Buck-Boost regulators, RTC and 38 LDOs. Contact Samsung for more information Ethernet controller Realtek RTL8153 The Realtek RTL8153-CG 10/100/1000M Ethernet controller combines an IEEE 802.3u compliant Media Access Controller (MAC), USB 3.0 bus controller. QFN-48 Package USB 3.0 Hub Genesys GL3521 The Genesys GL3521 is a 2-port, low-power, and configurable USB 3.0 SuperSpeed hub controller. QFN-48 Package USB Load Switch  NCP380 Protection IC for USB power supply from OnSemi. Input Power protector NCP372 Over-voltage, Over-current, Reverse-voltage protection IC from OnSemi. LED indicator Red LED is solid on when the power supply is connected. Blue LED to display the status of operating system. Two LEDs on the RJ45 Ethernet jack. Green Flashes when there is 100Mbps connectivity Yellow Flashes when there is 1000Mbps connectivity HDMI connector Standard Type-A HDMI, supports up to 1920 x 1080 resolution IO Ports USB 3.0 Host x 2, USB 2.0 Host x 1, PWM for Cooler Fan, UART for serial console Ethernet RJ-45, 30Pin : GPIO/IRQ/SPI/ADC, 12Pin : GPIO/I2S/I2C Storage slot Micro-SD slot, eMMC 5.0 module connector DC Input 5V / 4A input, Plug specification is inner diameter 2.1mm and outer diameter 5.5mm

 Note: 

The supplier of the product has no replacement and/or refund policy as part of their product warranty/guarantee. Furthermore, the repair cost and the cost of shipping to and fro from South Korea has to be borne. As Fab.to.Lab is merely an intermediary we extend the exact same warranty terms to all customers of Harkernel.

Please find more details here: Supplier warranty terms and conditions: https://www.hardkernel.com/agreement/

Package Includes:

1 x Odroid XU4

Accessories:

• Odroid XU4 Case
• Odroid XU4 Case Base Half
• Odroid XU4 Case Top Half
• Power Adapter 5V/4A
• Power Adapter 5V/6A