Low-power, fanless mini-ITX motherboard for Intel Celeron® SoC J3355 processors, with 5X Protection and HDMI/D-Sub/LVDS support
  • 5X Protection II – Advanced hardware safeguards for all-around protection
  • Fan Xpert：Dedicated CPU and case fan controls
  • New UEFI BIOS and EZ Mode：Friendlier, easier, and more intuitive with helpful info added
  • Fan Xpert: Active Quiet & Cool
PRIME J3355I-C
Reliable Stability and Compatibility
Reliable Stability and Compatibility
Intel CPU features
Optimized Cooling
Easy PC DIY
One-Stop Controls
1 2 x PS/2
2 LAN
3 USB 3.1 Gen 1
4 HDMI
5 COM
6 D-Sub
7 LPT
8 Audio
9 2 x U-DIMM,
DDR3 and DDR3L
10 Intel® Celeron®
Dual-core
Processor J3355
11 USB 2.0
12 M.2 E key
13 2 x SATA 6G/s Ports
14 PCI Express x4 slot
(@X1 mode)
15 LVDS

ASUS Prime is the next evolution of the ASUS motherboard, born of a pedigree that stretches back to 1989. Our team of world-class engineers are passionate about empowering everyone to enjoy the benefits of customization and tuning, and the driving force behind the development of Prime is to make advanced enthusiast controls easily accessible — maximizing performance, stability and compatibility for the very best DIY PC experiences. Simply stated: it's time for Prime.

Reliable Stability and Compatibility
Built to Last
ASUS is the world's foremost motherboard manufacturer, renowned for our unique Design Thinking approach. Our exhaustive testing exceeds industry standards, supported by high-quality components for exceptional real-world protection. Our motherboards are proven to be compatible with more than 1,000 components and devices, and each new model undergoes a minimum of 8,000 hours of strict validation. ASUS gives you the peace of mind of knowing that your motherboard is fit for all environments and applications. By choosing ASUS, you also gain the freedom to select outstanding component options, for trouble-free DIY experiences.

5X

Protection II

Hardware safeguards to ensure long-term durability.

520+

DDR4 Compatibility

Industry-leading DDR4 memory compatibility for best flexibility and reassurance.

1000+

Compatible Devices

Compatibility with a range of CPUs, memory modules, graphics cards and more.

8000+

Validation Hours

Extensive testing with latest components for enhanced reliability, compatibility and safety.

Advanced Hardware Safeguards

Industry-leading 5X Protection II employs the finest components, excellent circuit design, and exacting standards to guarantee quality and long-term durability of your motherboard with all-round protection. For you, that means exceptional protection and stability for your build — the result of decades of engineering experience from the world's leading motherboard brand.

LANGuard
Pumped-up throughput. 2.5x higher surge tolerance.
ASUS LANGuard is hardware-level networking protection that employs signal-coupling technology and premium anti-EMI surface-mounted capacitors to ensure a more reliable connection and better throughput, plus electrostatically guarded and surge-protected components for greater tolerance to static electricity and improved protection against surges.
* ESD result is undertaken by individual LANGaurd

* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

Overvoltage Protection
World-class circuit-protecting power design
An exclusive circuit design with built-in voltage regulators to protect your chipset, connectivity ports, and audio codecs from damage caused by unexpected high-level voltages from unstable or inferior power supplies. * Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

DRAM Overcurrent Protection

Short-circuit damage prevention
Onboard resettable fuses prevent overcurrent and short-circuit damage. This extends beyond I/O ports to DRAM to safeguard the lifespan of your system and connected devices.

Stainless-Steel Back I/O

3x corrosion-resistance for greater durability
Corrosion-resistant stainless-steel back I/O panels bonded with chromium oxide have a lifespan that's three times longer than ordinary panels.

* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

ESD Guards
Electrostatic discharge protection
ASUS ESD Guards prevent damage from electrostatic discharge, up to +/- 10kV for air discharge and +/- 6kV for contact discharge, arranged in an active-protective-circuit design that prolongs the life of components.
1
LAN port
ESD TVS diode protection on the LAN circuit.
2
USB connectors
TVS diodes for surface-mount and dual-inline packages.
3
VGA connectors
Additional on-circuit ESD TVS diodes to protect D-Sub functionality.
4
Keyboard and mouse connectors
Additional on-circuit ESD transient-voltage-suppression diodes.

* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

Proven Compatibility
Tested to be compatible with 1,000+ CPUs, DDR4 memory modules, graphics cards and more
Having the freedom to pick and choose the parts that go into your machine is at the heart of PC DIY. Our extensive certification program focuses on providing the very best compatibility with the widest range of components and devices, giving you the freedom to build and upgrade without frustration. Compatible today and compatible far into the future – that's the ASUS way.
Extensive List of Supported Devices
View supported devices and Qualified Vendor List for compatible memory
The superior compatibility of Prime series is evidenced by our extensive list of supported devices — which includes thousands of compatible components — and our Qualified Vendor List that identifies memory compatibility. That means more choices for worry-free PC-building experiences.
Great Compatibility
with ASUS Products
ASUS offers a suite of proprietary components — graphics cards, sound cards, optical drives — that perfectly complement the Prime series, so you can complete your custom motherboard build with confidence!

* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

Top-to-bottom Reliability
ASUS motherboards have superb endurance. We verify this by subjecting every board to more than 8,000 hours of stringent tests. A barrage of burn-in, environmental, compatibility, software and safety tests confirm that our motherboards are exceptionally robust. It also shows that ASUS reliability surpasses industry standards, ensuring that every component is designed to function flawlessly in any environment.
8000+
VALIDATION HOURS
Temperature and Humidity Test
Ensures components withstand extreme conditions.
Thermal Measurement Test
Ensures that the system remains cool and stable under the heaviest loads.
Insertion Test
Every port and connector is put through repeated installation cycles.
Aging Test
Up to 48-hour aging test ensures reliability.
Power Consumption Test
Checked for world-class energy efficiency.
Temperature and DC Margin Test
Ensures that the motherboard is capable of coping with Voltage fluctuations caused by varying temperatures.
Thermal Shock Test
Ensures ability to survive temperature changes during transportation.
Non-Operation Shock Test
Built to withstand jolts that may occur during shipping.
Burn-In Test
Every component is checked to ensure flawless operation in any environment.
Installation Test
Connector placement is double-checked to ensure hassle-free installation.
Drop Test
Drop tests from various heights ensure durability.
Salt and Spray Test
Tested for I/O reliability, prolonged lifespan and rust-resistance.
Optimized Cooling
Fan Xpert
Dedicated CPU and case fan controls

Exclusive Fan Xpert ensures every fan achieves the best balance of cooling performance and low noise - and with Prime series boards and their hardware-level 4-pin/3-pin PWM/DC mode for case fans, a simple BIOS adjustment lets you run your case fan in PWM/DC. Fan Xpert even includes Auto-Tuning mode to scan and detect all fan characteristics for single-click customization!

* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

Fan Xpert 2
Ultrafast Transfer Speeds
Instant front-panel USB 3.1 Gen 1 Experience
We've put USB 3.1 Gen 1 right where you need it - four super-speed ports on the front panel. Experience data-transfer speeds up to 10X faster than USB 2.0 with instant plug-and-play connectivity, so no more back-breaking contortions in the hunt for hard-to-reach rear ports!


* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

Easy PC DIY
Safe Motherboard Mounting
Component-free areas to minimize damage risk
Fitting your ASUS motherboard is now safer than ever. The comprehensive component-free ‘safe zones' around every case-mounting hole minimizes the risk of damage and short circuits caused by contact — so you'll assemble your PC with total confidence!
Q-DIMM
Easy memory removal
Even if you work with a smaller case, just push down on the one-sided clip and push or pull RAM modules in or out — removing memory is that simple!
One-Stop Controls
Media-acclaimed UEFI BIOS
The smoothest, slickest mouse-controlled graphical BIOS has been improved to make it even more appealing. Whether you're a PC novice or a seasoned overclocker, EZ and Advanced modes help you find your way, quickly and easily.
EZ Flash 3
Update the BIOS via the internet, without leaving the BIOS interface.
S.M.A.R.T
Check your storage device Self-Monitoring, Analysis, and Reporting Technology logs to gauge reliability and possibly to determine potential failures.
Q-Fan Control
You can configure the fan's operating speed manually, or use the easy pre-configured fan profiles to select Standard, Silent, Turbo, or Full Speed modes!
My Favorite
Quickly find tuning options and add preferred tools to the list.
EZ mode
  • Intuitive graphical fan control Fine-tune individual fans simply by dragging a curve with the mouse.
  • EZ XMP Improve DRAM performance with a click.
  • SATA information Easily display SATA port details for device identification.
  • Fast clock adjustment Use mouse controls to quickly change time and date settings.
Advanced mode
  • Last modified log Track last change and save preferred profiles onto a USB drive.
  • SATA port renaming Rename SATA ports for easy identification.
AI Suite 3
One-stop access to innovative ASUS features
ASUS AI Suite 3 offers a brand-new user experience through a clearer and more attractive interface with support for larger monitors. It consolidates all exclusive ASUS features into one simple-to-use package, allowing you to supervise overclocking, energy consumption, fan speeds, voltages and more. This all-in-one app offers diverse and easy-to-use functionality, with no need to switch back and forth between different utilities.

* Specifications and features vary by model, and all images are illustrative. Please refer specification pages for full details.

Intel CPU features
Power efficiency plus high-resolution graphics, thanks to the integrated Intel Celeron® Dual-Core SoC Processor J3355 with HD Graphics support.
This motherboard features an integrated Intel Celeron® Dual-Core Processor J3355 and Intel HD Graphics. This revolutionary 14nm ultra low voltage SoC (System On a Chip) combines superb processing power and advanced HD graphics support in one small, energy efficient design. Despite minimal power requirements, it still has the processing power to display the latest DirectX® 11.1 HD graphics. It features support for 4K/UHD (ultra-high-definition) resolutions of up to 3840 x 2160, and also has integrated USB 3.0 support.
  • Reliable Stability and Compatibility
  • Optimized Cooling
  • Ultrafast Transfer Speed
  • Easy PC DIY
  • One-Stop Controls
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