# eGPUs Offer Gaming Power but Face Limitations

External GPUs boost laptop gaming but come with trade-offs.

- **Source:** [Engadget](https://www.engadget.com)
- **Published:** 2026-09-17
- **Original article:** <https://www.engadget.com/2257761/egpu-come-with-limitations/>
- **On Brifing:** https://brifing.si/s/c20f2c37-5040-4e5e-a35d-f2193c3f6892

## What is an eGPU?

An eGPU, or external graphics processor, is a desktop graphics card housed in an enclosure connected to a laptop or gaming handheld via Thunderbolt or USB4. It allows thinner, weaker machines to run demanding games by taking over rendering tasks. However, performance is slower compared to a desktop setup due to bandwidth limitations.

## Performance Limitations

eGPUs operate slower over Thunderbolt than in desktops. Notebookcheck tested an RTX 2080 Ti enclosure in 2021, finding performance deficits ranging from 7% to 32%. Rendering to a laptop is slower because frames travel back through the same cable, unlike desktops where frames go directly to the monitor.

## Thunderbolt Bandwidth

Thunderbolt 4 offers 40Gbps, with PCIe data allocated 32Gbps—only an eighth of a desktop PCIe 4.0 x16 slot's bandwidth. Most GPU tasks stay within VRAM, but new assets and finished frames must traverse the cable, creating bottlenecks. Thunderbolt 5 improves this with 80Gbps, but compatible laptops are rare.

## Mid-Range GPUs Preferred

PC Gamer tested RTX 4070 Ti and 4090 GPUs over Thunderbolt and OCuLink. The RTX 4070 Ti ran 25% slower over Thunderbolt, with lower 1% lows and more stuttering. Upgrading to the 4090 showed smaller gains over Thunderbolt, making mid-range GPUs more sensible for eGPU setups.

## Cost Considerations

eGPU enclosures cost hundreds of dollars, and additional components like power supplies and Thunderbolt docks add to the expense. Razer's Core X V2 enclosure costs $350, with a Thunderbolt 5 dock priced at $390. Adding a GPU makes the setup comparable in cost to a budget gaming rig.

## OCuLink Alternative

OCuLink bypasses Thunderbolt by running bare PCIe over a cable, offering up to 128Gbps bandwidth. Framework’s OCuLink Dev Kit for its Laptop 16 uses this method. However, OCuLink lacks Thunderbolt’s plug-and-play convenience and doesn’t power the host device.

## Apple’s eGPU Support

Apple dropped eGPU support with its transition to Apple Silicon in 2020. Recent macOS releases haven’t restored it for gaming. However, Apple approved TinyGPU for AI workloads, allowing newer AMD and Nvidia cards to run over Thunderbolt or USB4, but without display output.

## Is an eGPU Worth It?

eGPUs offer a cost-effective way to boost gaming performance on laptops but come with significant trade-offs. Bandwidth limitations, high costs, and compatibility issues make them less practical than investing in a budget gaming rig. Thunderbolt 5 and OCuLink may improve future setups.

## Sources covering this story

- https://www.engadget.com/2257761/egpu-come-with-limitations/ — 

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_Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._