# What are the limitations of eGPUs vs onboard graphics cards for laptops?

- URL: https://talkfuse.com/story/what-are-the-limitations-of-egpus-vs-onboard-graphics-cards-for-laptops/
- Published: 2026-11-15T00:30:00+00:00
- Updated: 2026-11-15T01:03:40+00:00
- Original publisher: Engadget
- Original article: https://www.engadget.com/2313636/limitations-egpu-vs-onboard-graphics-card-laptop-pc/
- Topics: Gadgets, Technology

## Key points

- eGPUs can add desktop graphics power to a laptop.
- Thunderbolt and USB4 can constrain performance.
- Enclosures, power supplies and cards add cost and bulk.

## Summary

An external GPU can give a laptop access to a desktop graphics card when it is connected at a desk, but the setup does not deliver the card’s full potential in every situation. Its performance can be limited by the Thunderbolt or USB4 connection, and the extra equipment reduces the portability and simplicity that make laptops useful.

The article compares NVIDIA’s RTX 5090 desktop card, with 21,760 CUDA cores and 575W total graphics power, with the laptop version, which has 10,496 cores and a 95W to 150W power range. Thunderbolt 4 provides 32 Gbps of PCIe throughput, while Thunderbolt 5 provides 64 Gbps; neither figure represents the GPU’s full memory bandwidth. Performance also depends on the laptop, enclosure, graphics card and game, and using the laptop’s own screen can add a further penalty. A compatible enclosure may cost about $350, before buying a graphics card and power supply.

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Summarised by TalkFuse (https://talkfuse.com/). Quote the original publisher for the reporting and link this page for the summary and discussion.