JUSTOP Black 650W PSU vs GeeekPi USB-C Power Supply UK Plug for Raspberry Pi 5

Power Capacity and Output

The JUSTOP Black 650W PSU delivers a significantly higher power capacity at 650 watts compared to the GeeekPi USB-C Power Supply’s 27 watts maximum output. This vast difference means the JUSTOP PSU is designed for desktop PCs requiring substantial power, while the GeeekPi unit is tailored specifically for lower-power devices like the Raspberry Pi 5.

The JUSTOP PSU features multiple connectors including a 20+4 pin, 4+4 pin, SATA, Molex, and PCIe, supporting a range of desktop components. In contrast, the GeeekPi supply provides multiple voltage outputs—5V at 5A, 9V at 3A, 12V at 2.25A, and 15V at 1.8A—via USB-C, optimised for portable and low-power electronics. Therefore, power needs differ greatly between these two, with the JUSTOP suited to heavy-duty PC builds and the GeeekPi ideal for compact computing like Raspberry Pi 5 models.

Compatibility and Intended Use

The GeeekPi USB-C Power Supply is explicitly compatible with Raspberry Pi 5 models featuring 4GB or 8GB RAM, ensuring optimal performance for these single-board computers. This dedicated compatibility makes it a reliable choice for Raspberry Pi enthusiasts requiring a stable 5V 5A power source with added versatility through additional voltage options.

On the other hand, the JUSTOP Black 650W PSU is designed for desktop PCs, supporting a wide range of hardware through its ATX standard connectors. Its multiple outputs and higher wattage cater to typical desktop components rather than niche devices. Hence, the GeeekPi supply is specialised for Raspberry Pi users, while the JUSTOP PSU suits general PC builders needing robust power delivery.

Safety Features and Certifications

Both power supplies incorporate safety protections to ensure reliable and safe operation. The JUSTOP Black 650W PSU includes over voltage protection, over power protection, short circuit protection, and thermal overload cut-off protection, alongside certifications such as UKCA, CE, FCC, UL, and TUV Electrical Safety. These certifications indicate compliance with rigorous safety and quality standards.

The GeeekPi USB-C Power Supply also offers safety features including over-current protection, over-voltage protection, and short-circuit protection. While specific certifications are not listed, the presence of these protections combined with a high-quality copper wire core and inline noise filter suggests a focus on maintaining device safety and stable power transmission.

In summary, the JUSTOP PSU’s extensive certifications make it a strong contender for regulated desktop use, whereas the GeeekPi supply emphasises safety for portable and device-specific applications.

Design and Portability

The GeeekPi USB-C Power Supply is designed with portability in mind, featuring a compact form factor that makes it easy to carry. Its worldwide input voltage compatibility (100-240V) and frequency range (50/60Hz) further enhance its suitability for travel and use in varied environments.

Conversely, the JUSTOP Black 650W PSU is a standard ATX desktop power supply equipped with a 120mm cooling fan and multiple connectors with cable lengths up to 640mm, making it larger and less portable. It is intended to be installed within desktop PC cases rather than carried around.

Therefore, for users prioritising compactness and travel-friendliness, the GeeekPi supply is the clear choice, while the JUSTOP PSU is designed for stationary desktop setups.

Price and Value

At £29.99, the JUSTOP Black 650W PSU is more than twice the price of the GeeekPi USB-C Power Supply, which retails for £13.80. The higher cost reflects the JUSTOP’s greater power capacity and extensive connector options suitable for desktop PCs.

The GeeekPi supply’s lower price aligns with its targeted use for Raspberry Pi 5 devices and its lower wattage output. For Raspberry Pi users, this represents good value given the product’s tailored compatibility and multiple voltage outputs. However, for desktop PC builders requiring a reliable 650W power source with comprehensive safety certifications, the JUSTOP PSU justifies its higher price point.

Ultimately, budget and intended use will heavily influence which power supply offers better value.

Connectivity and Output Options

The JUSTOP PSU offers a broad range of connectors, including a 20+4 pin main power connector, a single 8-pin (4+4) 12V rail, three SATA connectors, one Molex connector, and a PCIe connector. This array supports various desktop components, offering flexibility in powering motherboards, graphics cards, and drives.

In contrast, the GeeekPi adapter provides multiple output voltage options via a USB-C port: 5V at 5A, 9V at 3A, 12V at 2.25A, and 15V at 1.8A, leveraging Power Delivery technology to fast charge compatible devices. This makes it versatile within its niche, allowing it to adapt to different power requirements for portable electronics beyond just the Raspberry Pi 5.

Hence, the JUSTOP PSU is connectivity-rich for desktop hardware, whereas the GeeekPi supply focuses on flexible USB-C output suited to various small devices.

Cooling and Noise Management

The JUSTOP Black 650W PSU includes a 120mm cooling fan to manage heat dissipation, which is important for maintaining stable performance in high-power desktop environments. Such a fan likely produces some noise during operation but is essential to prevent overheating.

The GeeekPi USB-C Power Supply, being a small, compact adapter designed for lower wattage, relies on passive cooling and does not mention any fan. This generally results in silent operation, suitable for quiet environments or portable use.

Therefore, while the JUSTOP PSU uses active cooling to support higher power loads, the GeeekPi supply’s fanless design benefits users prioritising silent power delivery.

Which should you buy?

Your choice depends primarily on your power needs and device compatibility. If you require a robust power supply for a desktop PC with a 650W capacity, multiple connectors, and safety certifications, the JUSTOP Black 650W PSU at £29.99 is the clear option. It supports a wide range of desktop components and offers extensive protection features required for stable PC operation.

Conversely, if you need a compact, portable power supply specifically for the Raspberry Pi 5 (4GB or 8GB), the GeeekPi USB-C Power Supply at £13.80 is tailored for that purpose. It offers multiple voltage outputs, Power Delivery support, and useful safety features in a travel-friendly design.

In summary, choose the JUSTOP PSU for desktop computing power and the GeeekPi supply for Raspberry Pi 5 and portable device charging.