Radxa

Radxa ROCK Pi 4B+

Expert rating7 / 10

SoC:: Rockchip RK3399Pro
CPU:: Hexa-core (Dual Cortex-A72 + Quad Cortex-A53)
NPU:: Dedicated AI accelerator (RK3399Pro)
RAM:: Up to 4GB LPDDR4
Price:: From roughly $70

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Manufacturer: Radxa Last updated: September 11, 2026

Radxa ROCK Pi 4B+ Review

The ROCK Pi 4B+ upgrades Radxa's original RK3399-based ROCK Pi 4 with the RK3399Pro variant, adding a dedicated NPU that the standard RK3399 lacks, a distinguishing feature among the several RK3399-family boards in this catalog.

Where most RK3399 boards (including the FriendlyElec NanoPi M4 covered in this batch) use the standard chip without dedicated AI hardware, the RK3399Pro in the ROCK Pi 4B+ adds an NPU specifically for on-device inference workloads.

The NPU-Equipped RK3399 Variant

A Familiar Radxa Form Factor

Sharing its general layout and community with the newer Radxa ROCK 5 series already represented on this site, the ROCK Pi 4B+ gives buyers a lower-cost, NPU-equipped alternative for projects that don't need RK3588-class CPU performance.

Comparison to Alternatives

Against the FriendlyElec NanoPi M4 covered in this batch, the ROCK Pi 4B+ uses the NPU-equipped RK3399Pro variant rather than the standard RK3399, adding on-device AI inference capability. Against the Radxa ROCK 5C already on this site, the 4B+ trails significantly in raw performance but costs less and still includes NPU hardware.

Our verdict

Reviewed by Burooj Alam. Rated by us, not by users.

Expert rating7 / 10

NPU-equipped RK3399-class hardware at well under RK3588 pricing.

Best for

Buyers who want NPU-equipped RK3399-class hardware at a lower price than RK3588 boards.

Not for

Anyone who needs RK3588-class raw CPU performance.

Specifications

What these specs mean

Identity

Brand	Radxa

Price	70 USD

FAQs

What are the key specifications of the Radxa ROCK Pi 4B+ (Single-Board Computer/Rockchip RK3399Pro/Hexa-Core/Dedicated NPU/Up to 4GB LPDDR4)?

The Radxa ROCK Pi 4B+ (Single-Board Computer/Rockchip RK3399Pro/Hexa-Core/Dedicated NPU/Up to 4GB LPDDR4) is a single board computer from Radxa. Key specs: SoC Rockchip RK3399Pro, CPU Hexa-core (Dual Cortex-A72 + Quad Cortex-A53), NPU Dedicated AI accelerator (RK3399Pro), RAM Up to 4GB LPDDR4, Price From roughly $70.

Will the Radxa ROCK Pi 4B+ (Single-Board Computer/Rockchip RK3399Pro/Hexa-Core/Dedicated NPU/Up to 4GB LPDDR4) work with my current setup?

The Radxa ROCK Pi 4B+ (Single-Board Computer/Rockchip RK3399Pro/Hexa-Core/Dedicated NPU/Up to 4GB LPDDR4) lists SoC is Rockchip RK3399Pro. Check that against the hardware you already own before buying, since this is the field that most often decides whether a part fits.

Who is the Radxa ROCK Pi 4B+ (Single-Board Computer/Rockchip RK3399Pro/Hexa-Core/Dedicated NPU/Up to 4GB LPDDR4) best suited to?

Best suited to: Buyers who want NPU-equipped RK3399-class hardware at a lower price than RK3588 boards.

What are the drawbacks of the Radxa ROCK Pi 4B+ (Single-Board Computer/Rockchip RK3399Pro/Hexa-Core/Dedicated NPU/Up to 4GB LPDDR4)?

Not the best fit for: Anyone who needs RK3588-class raw CPU performance.