ASRock 4X4 BOX-4300U AMD Ryzen 4000U Mini PC Barebone — main product image

ASRock 4X4 BOX-4300U AMD Ryzen 4000U Mini PC Barebone

ASRock

ASRock 4X4 BOX-4300U AMD Ryzen 4000U Mini PC Barebone

Name: ASRock 4X4 BOX-4300U AMD Ryzen 4000U Mini PC Barebone
Brand: ASRock
SKU: 4X4 BOX-4300U

64GB DDR4USB 3.2USB 2.0

AMD Ryzen 4300U in a 4x4-inch barebone gives you a quad-display, dual-LAN compact platform that punches well above its footprint for edge, kiosk, and light workstation deployments.

$309.99*

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The ASRock 4X4 BOX-4300U is a barebone mini PC built around the AMD Ryzen 3 4300U — a 4-core, 4-thread 7nm Zen 2 processor operating within a 15W TDP envelope. That power budget governs the performance ceiling: the 4300U delivers capable single-threaded performance and sufficient multi-threaded throughput for productivity and light server workloads, but the thermal constraints of the compact chassis mean prolonged 100% CPU utilization results in clock speed reduction. What distinguishes this platform from the field of 4x4-inch mini PCs is its display output capability: HDMI 2.0a (4K/60Hz) and three DisplayPort 1.2a outputs (two via USB Type-C) enable simultaneous quad-display configurations without any external GPU hardware. Paired with dual LAN — 1GbE and 2.5GbE with DASH remote management support — this is a well-specified platform for distributed deployments. The SO-DIMM ceiling of 64GB DDR4-3200 and the triple storage interface (M.2 Key M, M.2 Key E, SATA3) make it more configurable than most compact platforms in its class.

The 4X4 BOX-4300U targets IT administrators and system integrators building edge computing nodes, digital signage controllers, thin client replacements, or space-constrained workstations where quad display output and manageable power draw matter more than raw compute performance. The DASH-capable 2.5GbE NIC is a genuine enterprise feature at this form factor — it enables remote power cycling and BIOS-level management for units deployed in locations where physical access is inconvenient. As a barebone, the total system cost requires factoring in DDR4 SO-DIMMs (16–32GB is the practical sweet spot for the 4300U's capabilities), an NVMe M.2 SSD, and optionally a wireless M.2 card. For deployments where the quad display capability and dual LAN are the specific requirements, this is one of the few compact platforms that delivers both without compromise. For users who primarily need compute performance, moving up to the Ryzen 5 or 7 4000U variants in ASRock's lineup provides hyperthreading and higher sustained clock speeds within the same ecosystem.

Key Features

AMD Ryzen 4000U-Series

2 x 260-pin SO-DIMM up to 64GB DDR4 3200 MHz

3 x USB 3.2 Gen2, 2 x USB 2.0, 1 x M.2 Key M, 1 x M.2 Key E, 1 x SATA3

1 x Realtek 1 Gigabit LAN, 1 x Realtek 2.5 Gigabit LAN (Support DASH)

Supports Quad display, 1 x HDMI 2.0a, 3 x DP 1.2a (2 from Type C)

Specifications

Processor

AMD Ryzen 3 4300U (4-core, 4-thread, Zen 2, 7nm, 15W TDP)

Memory Slots

2x 260-pin SO-DIMM, DDR4 up to 3200 MHz, max 64GB

Storage

1x M.2 Key M, 1x M.2 Key E, 1x SATA3

USB Ports

3x USB 3.2 Gen2 (10 Gbps), 2x USB 2.0

LAN

1x Realtek 1 Gigabit, 1x Realtek 2.5 Gigabit (DASH support)

Display Output

1x HDMI 2.0a, 3x DisplayPort 1.2a (2 via USB Type-C)

Max Display Support

4 simultaneous displays

Power Adapter

19V / 90W (included)

Form Factor

4x4-inch (101.6 x 101.6mm) mini PC

Pros & Cons

👍 Pros

Quad display support (HDMI 2.0a + 3x DP 1.2a) in a 4x4-inch enclosure is rare at this form factor — enabling multi-monitor deployments without any external GPU or dock.
Dual LAN with a 2.5 Gigabit port alongside the 1 Gigabit port provides network throughput flexibility; the 2.5GbE also supports DASH for remote management.
Three USB 3.2 Gen2 (10 Gbps) ports allow simultaneous high-bandwidth peripheral connections without creating a shared-bandwidth bottleneck.
SO-DIMM support up to 64GB DDR4-3200 gives this barebone headroom well beyond typical mini PC competitors — 64GB is sufficient for light virtualization and memory-intensive applications.
M.2 Key M + M.2 Key E + SATA3 triple storage interface options allow flexible configurations: NVMe primary, SATA secondary, and wireless card simultaneously without conflict.

👎 Cons

Ryzen 3 4300U has 4 cores without simultaneous multi-threading — sustained multi-threaded workloads (compilation, video encoding, VM hosting) will saturate available threads faster than a Ryzen 5 or 7 4000U variant.
Barebone configuration requires separate purchase of RAM, storage, and optionally a wireless card — total system cost is meaningfully higher than the barebone price alone.
The 15W TDP envelope in a compact chassis means the 4300U will throttle under prolonged 100% CPU load — thermal headroom is limited and the system prioritizes sustained operation over peak burst performance.
No Thunderbolt support — the USB Type-C ports deliver DisplayPort and USB 3.2 Gen2, but not Thunderbolt 3/4 bandwidth or daisy-chaining capability.
The M.2 Key E slot is populated by ASRock's Intel wireless card in some bundles, but the barebone version may ship without it — wireless requires a separate M.2 Key E WiFi/BT card purchase.

Frequently Asked Questions

What RAM and storage do I need to purchase separately to make this barebone functional?

The 4X4 BOX-4300U ships without RAM or storage — you must supply both. It accepts up to 64GB via two 260-pin SO-DIMM slots running DDR4 at up to 3200 MHz. For storage, the M.2 Key M slot supports NVMe or SATA M.2 SSDs (2280 form factor); there is also a SATA3 port for a 2.5" drive and an M.2 Key E slot for a wireless card. A 19V/90W DC power adapter is included.

Which AMD Ryzen 4000U processor is installed, and what does that mean for performance?

This unit ships with the Ryzen 3 4300U — a 4-core, 4-thread (no SMT) processor on the 7nm Zen 2 architecture with integrated Radeon graphics. The 4300U's 4 cores without hyperthreading make it a capable light-workload chip — office productivity, web browsing, media playback, and light development tasks — but it will throttle under sustained multi-threaded loads due to the 15W TDP envelope in this enclosure.

Can this unit drive four monitors simultaneously?

Yes. The 4X4 BOX-4300U supports quad display output via 1x HDMI 2.0a and 3x DisplayPort 1.2a, with two of the DP outputs delivered through USB Type-C ports. All four outputs can be active simultaneously — confirmed by ASRock's specifications. HDMI 2.0a supports 4K at 60Hz; DP 1.2a supports up to 4K at 60Hz per display.

What is DASH support on the 2.5 Gigabit LAN port, and is it useful?

DASH (Desktop and Mobile Architecture for System Hardware) is a DMTF standard for out-of-band management of client systems — think iDRAC or iLO for desktops. The Realtek 2.5GbE NIC on this board supports DASH, enabling remote power control, BIOS configuration, and system monitoring without a running OS. It's relevant for enterprise deployments where centralized management of distributed mini PCs is needed.

What are the USB bandwidth capabilities of the 3x USB 3.2 Gen2 ports?

USB 3.2 Gen2 delivers 10 Gbps per port — double the 5 Gbps of USB 3.2 Gen1. With three Gen2 ports, this unit can simultaneously run high-bandwidth peripherals (NVMe enclosures, video capture devices, 10GbE adapters) without port contention throttling individual device throughput.