A recent experiment by tech enthusiast channel Dawid Does Tech Stuff has demonstrated some of the challenges of integrating a high-performance desktop GPU like the GeForce RTX 4090 into a compact device like the Cybertruck Mini-PC. The project, while initially intriguing, faced several hurdles that limited its full potential.

The Cybertruck Mini-PC, designed to resemble Tesla’s electric vehicle, presented a pretty unique challenge for testing the capabilities of external GPUs. However, the device’s design and limited expansion options posed significant hurdles. One of the main obstacles was the lack of a readily accessible secondary M.2 slot typically used to connect storage devices – resulting in a reliance on external storage solutions only.

RTX 4090 Cybertruck experiment

To get over the M.2 slot issue, Dawid explored using a PCIe adapter to connect the RTX 4090 to the Mini-PC’s built-in M.2 WiFi slot. However, this approach proved to be less than ideal due to the adapter’s two-lane limitation. The RTX 4090, a 450W TDP model, was only able to draw 60W of power under most testing conditions, resulting in performance that was even lower than the integrated Radeon 780M graphics.

In an effort to overcome these limitations, Dawid decided to remove the Cybertruck’s chassis and use a bare motherboard with an M.2 to OCuLink connector. This setup allowed the RTX 4090 to reach closer to its full potential, drawing 400W of power and delivering the expected level of performance.

Challenges of getting high performance in a mini PC

The experiment highlights the challenges of integrating high-performance components into devices that are not specifically designed for them. While M.2 and OCuLink PCIe adapters can be a viable option for some users, finding space for these components in laptops or Mini-PCs can be difficult. Additionally, the Cybertruck Mini-PC’s unique design and repurposed laptop motherboard make it a less-than-practical solution for most consumers.

External GPUs may provide a more innovative solution that addresses the challenges faced by Dawid Does Tech Stuff. However, for now, the limitations of mobile Zen 4 APUs and the constraints of compact devices make it difficult to justify the use of a high-performance GPU like the RTX 4090 as an external graphics card.

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Tom Valentine

Tom is a tech writer with a detailed view on ensuring the best buying advice, most useful information, and latest news makes its way into PC Guide's articles.