Imagine a sleek, smoky black translucent box that could transform your laptop or handheld into a powerhouse. That’s exactly what ASUS has just unveiled with the 2025 XG Mobile, the world’s inaugural Thunderbolt 5 external graphics processing unit (eGPU). This device isn’t just another piece of gaming gear; it’s potentially the most versatile single-cable portable docking station we’ve seen to date.

When you connect your device to this eGPU, you’re not just getting an upgrade in graphical performance. You’re tapping into NVIDIA‘s cutting-edge GeForce RTX 5090 mobile chip, nestled within a compact design that also supplies up to 140 watts of power. It’s like having an entire workstation in your bag, capable of supporting two monitors, a USB and SD card hub, and even offering a 5Gbps Ethernet connection all at once through one cable.

The magic here is in the Thunderbolt 5 technology, which boasts an 80 gigabit per second bidirectional link. This is a leap forward from previous standards, allowing for an unprecedented level of connectivity and power with just one connection. This makes the XG Mobile not only the first of its kind to use Thunderbolt 5 but also one of the first docks to leverage this new standard’s capabilities.

Historically, ASUS’s XG Mobile series was somewhat limited by its proprietary connection, which meant only a select few ASUS devices could fully utilize its potential. However, with the shift to Thunderbolt 5, the compatibility expands dramatically, bringing this power to any device with Thunderbolt 4, USB4, or ideally, Thunderbolt 5 ports. This is a significant pivot from its predecessors, which were confined to ASUS’s eco-system with proprietary connectors.

Despite its innovative approach, the XG Mobile doesn’t claim to be the absolute peak of eGPU performance. Larger docks with desktop GPUs still have their place for those seeking the ultimate in graphics power. Yet, according to ASUS representative Anthony Spence, the Thunderbolt 5 link provides up to 64Gbps of bandwidth specifically for the NVIDIA graphics — a bandwidth that matches Oculink and surpasses USB4. The engineering feat is impressive, squeezing all this capability into a package that weighs less than 2.2 pounds, complete with an internal 350W power supply, eliminating the need for an external power brick.

ASUS has managed to make this new model 25% lighter and 18% smaller than its previous iteration, enhancing its portability. It features HDMI 2.1 and DisplayPort 2.1 for high-quality video output, alongside two 10Gbps USB-A ports for additional connectivity.

However, innovation doesn’t come cheap. The high-end version of the XG Mobile, equipped with the RTX 5090, is set to retail at $2,199.99, which might make enthusiasts think twice, considering you could build a more powerful, albeit stationary, setup for that price. For those looking for a balance between cost and performance, there’s a more affordable version with NVIDIA’s RTX 5070 Ti, priced at $1,199.99.

The real challenge might be finding a device that benefits most from this eGPU. While it’s compatible with Thunderbolt 4 and USB4 devices, including the ROG Ally X, the full potential is realized with Thunderbolt 5. This could nudge thin-and-light laptop manufacturers to design systems that leverage this technology, offering users a potent, portable desktop experience.