Rockchip RK3328 appeared in 2017 as an inexpensive processor for 4K TV boxes, streaming devices, and compact single-board computers. Its specification still looks surprisingly usable: four 64-bit CPU cores, HDMI 2.0a, hardware decoding of modern video formats, Gigabit Ethernet support, and even USB 3.0.
The problem is that multimedia features can make an old processor appear more capable than it really is. RK3328 can decode 4K video efficiently, but its Cortex-A53 CPU and Mali-450 GPU are now slow for a desktop environment, modern Android applications, gaming, or computational workloads. It remains useful when the task closely matches its original purpose, but it is no longer a sensible general-purpose platform for most new projects.
Rockchip RK3328 specifications
RK3328 integrates four Cortex-A53 cores running at up to 1.5 GHz. It supports DDR3, DDR3L, LPDDR3, and DDR4 memory, although the actual memory type and capacity depend on the board. Rockchip also included HDMI 2.0a, USB 3.0, USB 2.0, an integrated Fast Ethernet PHY, and an RGMII interface for an external Gigabit Ethernet PHY.
| Feature | Rockchip RK3328 |
| Release year | 2017 |
| Manufacturing process | 28 nm |
| CPU | 4× Arm Cortex-A53 |
| Maximum CPU frequency | Up to 1.5 GHz |
| Architecture | 64-bit Armv8-A |
| GPU | Mali-450 MP2 |
| Memory support | DDR3, DDR3L, LPDDR3, DDR4 |
| Video decoding | H.265, H.264, and VP9 up to 4K |
| HDR | HDR10 and HLG |
| Video output | HDMI 2.0a with HDCP 2.2 |
| USB | USB 3.0 and USB 2.0 |
| Networking | Integrated Fast Ethernet PHY; RGMII for Gigabit Ethernet |
| PCIe | No |
| NPU | No |
| Typical applications | TV boxes, media players, compact servers, and low-cost SBCs |
This combination explains why the processor appeared in boards such as the ROCK64, Libre Computer Renegade, NanoPi R2S, and several older TV boxes. It provided enough connectivity for a media player or lightweight network appliance without the cost and complexity of a higher-end SoC.
Cortex-A53 is efficient, but no longer fast
The four CPU cores are based on the 64-bit Armv8-A architecture. According to the official Arm Cortex-A53 overview, the core was designed to combine reasonable performance with low power consumption and could be deployed in mobile, networking, storage, automotive, and digital television products.
That made sense for RK3328. A TV box spends much of its time waiting for input or passing video to a dedicated decoder, so it does not need large, high-performance CPU cores. The same design works well for DNS filtering, a lightweight VPN gateway, basic file sharing, or a small Linux service that remains mostly idle.
The limitation becomes obvious under interactive or sustained workloads. Four Cortex-A53 cores cannot provide the responsiveness expected from a modern desktop, and software compilation, complex web pages, emulation, and multitasking all expose the processor’s age. Newer designs using Arm Cortex-A76 architecture offer much higher per-core performance, not simply a higher clock speed.
The video engine is stronger than the CPU
Video playback is the part of RK3328 that has aged best. The hardware decoder supports H.265, H.264, and VP9 at up to 4K resolution, together with HDR10 and HLG. HDMI 2.0a allows compatible devices to output 4K video at 60 Hz, while HDCP 2.2 was important for commercial streaming equipment. These capabilities are also listed in the official Rockchip RK3328 specifications.
This does not mean that every RK3328 board will play every 4K file correctly. Hardware support still depends on the operating system, media framework, player, and device-specific drivers. When the decoder is working, CPU usage can remain low; when decoding falls back to software, four Cortex-A53 cores quickly become the bottleneck.
The Mali-450 MP2 GPU is considerably less impressive. It can render a basic Linux or Android interface, but it belongs to an older graphics generation and is unsuitable for demanding games or GPU computing. RK3328 is therefore much better at displaying completed video than creating graphics, editing footage, or accelerating modern applications.
USB 3.0 and Ethernet keep it useful
Many inexpensive TV-oriented processors from the same period were limited to USB 2.0. RK3328 includes USB 3.0, making an external SSD or fast hard drive far more practical. This is one reason boards based on the chip have remained useful as small file servers, download boxes, and network appliances.
Networking requires closer attention to the board specification. RK3328 contains a Fast Ethernet PHY but can also connect to an external Gigabit Ethernet PHY through RGMII. Consequently, one RK3328 device may be limited to 100 Mbps while another provides a proper Gigabit Ethernet port. The processor name alone does not reveal the actual network speed.
The absence of PCIe is a more permanent restriction. NVMe storage, high-speed network adapters, and other PCIe peripherals cannot be attached in the same way as on newer SBC platforms. USB 3.0 partly compensates for this limitation, but it does not offer the same flexibility.
Linux support depends on the board
RK3328 has been used in Linux boards for years, and support for the SoC is available in the mainline Linux kernel. Mature community images exist for several popular models, making a well-supported RK3328 board more practical than its age might suggest.
However, support is not identical across all devices. Ethernet, audio, HDMI output, hardware video decoding, Wi-Fi, and boot storage can behave differently depending on the board and system image. An old TV box with an undocumented Wi-Fi chip is a much riskier Linux platform than a known SBC with maintained Device Tree files and community documentation.
The same problem applies to Android. Hardware compatibility is tied to the manufacturer’s firmware, and an old image may contain outdated security components even if video playback still works. Our guide to running Android on Orange Pi PC examines similar limitations on another older SBC: installing Android is often easier than obtaining a current, fully accelerated, and properly supported system.
RK3328 compared with newer Rockchip processors
| Feature | RK3328 | RK3566 | RK3576 |
| CPU | 4× Cortex-A53 | 4× Cortex-A55 | 4× Cortex-A72 + 4× Cortex-A53 |
| Maximum frequency | 1.5 GHz | 1.8 GHz | 2.2 GHz |
| Manufacturing process | 28 nm | 22 nm | 8 nm |
| GPU | Mali-450 MP2 | Mali-G52 2EE | Mali-G52 MC3 |
| NPU | None | 0.8 TOPS | 6 TOPS |
| Maximum video decoding | 4K | 4K | 8K |
| PCIe | No | PCIe 2.1 | PCIe 2.1 |
| Best fit | Media players and basic services | Entry-level modern SBCs | Edge AI and industrial systems |
RK3566 is a more practical entry-level choice for a new SBC. Its Cortex-A55 cores are newer, the GPU is substantially more capable, and PCIe expands the available storage and networking options. It also includes a small NPU, although 0.8 TOPS is limited by current standards.
RK3576 belongs to a different performance class. It combines eight CPU cores with a 6 TOPS NPU, 8K multimedia support, and a much newer 8-nm manufacturing process. Our detailed Rockchip RK3576 specifications and performance article explains why it is better suited to industrial computing, computer vision, and modern edge AI.
Is Rockchip RK3328 still worth using?
RK3328 is still reasonable when the hardware is already available and the workload is modest. It can run a media player, DNS server, lightweight NAS, home automation service, or simple network gateway without requiring much power or cooling. A mature Linux image may make an older RK3328 board more reliable than a newer but poorly supported alternative.
For a new product, however, the processor is difficult to justify. Its CPU and GPU offer little performance reserve, it lacks PCIe and an NPU, and the 28-nm process is inefficient compared with modern Rockchip platforms. RK3328 has aged well as a specialized 4K media processor, but it should not be mistaken for a modern general-purpose SoC.
FAQ
Does Rockchip RK3328 support 4K video?
Yes. It supports hardware decoding of H.265, H.264, and VP9 video at up to 4K, as well as HDMI 2.0a, HDR10, and HLG. Actual playback depends on software and driver support.
Can RK3328 run Linux?
Yes. RK3328 is supported by the mainline Linux kernel, and several established SBCs have community Linux images. Compatibility still varies between individual boards and TV boxes.
Does RK3328 have an NPU?
No. It has no dedicated neural processing unit, so AI inference must run on the CPU or an external accelerator.
Is RK3328 good for a NAS?
It can handle a lightweight home NAS, especially on a board with Gigabit Ethernet and USB 3.0. The lack of PCIe and modest CPU performance limit more demanding storage configurations.