This $250 pocket-sized eGPU boosts Cyberpunk 2077 from 45 FPS to 80 FPS at 1080p while consuming only 25 W
We recently saw how a gaming handheld works with an external GPU dock, but what would happen if we ran the entire setup on battery power and threw lossless scaling into the mix? The popular YouTuber, ETA PRIME, tried just that and the results are pretty surprising.
In their latest experiment, ETA PRIME decided to push the limits of portable gaming by running a fully battery-powered dual GPU setup on the Lenovo Legion Go 2. To make this setup work, the YouTuber connected the Lenovo Legion Go 2 to the Adlink Pocket AI GPU enclosure using the device’s USB4 port. The external unit contains an embedded Nvidia RTX A500 GPU, powered entirely by a high-capacity external power bank instead of wall power.
Although not primarily meant for gaming, the Adlink Pocket AI can still handle light gaming and older titles, offering a decent performance boost for systems without a dedicated GPU. Its main focus, however, remains on accelerating AI workloads, 3D rendering, and other professional computing tasks.
Since the Pocket AI GPU doesn’t include any video output, all rendering still took place on the Legion Go 2’s internal display, with the generated frames fed back through the USB4 connection.
Once the hardware was connected, the next step involved installing the Lossless Scaling utility from Steam, a lightweight application that handles AI-driven frame generation. Within Windows’ Graphics Settings, the YouTuber manually assigned the Radeon 890M iGPU as the main graphics processor for gaming while designating the external RTX A500 for frame generation. This made sure that rendering and frame-generation workloads were separated between the two GPUs.
With everything configured, the YouTuber began testing. The first test was God of War: Ragnarok, running at 1200p resolution on high settings with FSR set to Quality. Using only the integrated Radeon 890M iGPU, the Lenovo Legion Go 2 hovered around 35–40 FPS. After enabling Lossless Scaling, however, frame rates immediately jumped to the 70 FPS range.
In this setup, the external RTX A500 didn’t render the game directly but instead generated interpolated frames and back-fed them to the Legion Go 2’s internal display over the USB4 connection. The GPU enclosure drew roughly 25 watts from the power bank, while the iGPU continued handling native rendering duties.
In Cyberpunk 2077, one of the most demanding titles in the test suite, the Ryzen Z2 Extreme APU initially struggled to maintain 45 FPS at 1080 p high settings and FSR Balanced mode. Once Lossless Scaling was enabled, the handheld climbed into the 80 FPS range, effectively doubling its perceived smoothness. Even though the back-feed of frames through the USB 4 interface limited overall throughput, frame pacing remained stable.
Given that both the Legion Go 2 and the external GPU enclosure were running entirely on battery power, this setup became a completely portable dual-GPU configuration.
Ultimately, the experiment showed that with the right tuning, even a low-power RTX A500 could meaningfully enhance a handheld’s gaming experience. If you’re interested in creating a similar setup yourself, check out the full video linked below for the step-by-step process.
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