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ASUS ROG XG Mobile vs Sonnet eGFX Breakaway Box 550: Comparison
ASUS ROG XG Mobile and Sonnet eGFX Breakaway Box 550 separate most on psu wattage: ASUS ROG XG Mobile at 330, Sonnet eGFX Breakaway Box 550 at 550, 40% in favour of Sonnet eGFX Breakaway Box 550. Host Power Delivery splits them by another 13%, this time favouring ASUS ROG XG Mobile.
Specs
| Specification |  |  |
|---|---|---|
| Connection Standard | Proprietary ROG XG Mobile interface (PCIe-based) | Thunderbolt 3 |
| Brand | ASUS | Sonnet |
| Extra Ports | HDMI 2.1, DisplayPort 1.4, 2.5G Ethernet, USB-A 3.2, USB-C | None onboard beyond the GPU's own outputs |
| PSU Wattage | 330-40% | 550 |
| Host Power Delivery | 100 | 87-13% |
| Cooling Type | Active blower with dedicated vapor chamber | Active Fan |
| Model | ROG XG Mobile (2023) | eGFX Breakaway Box 550 |
| GPU Compatibility | Fixed: pre-installed GeForce RTX 4090 Laptop GPU, 16GB GDDR6 (not swappable) | GTX 10-series through RTX 20-series and equivalent AMD cards, double-wide |
| Price | Launched at $1,999.99 (2023) | Launched around $399 (2017) |
Price comparison
| Retailer | ASUS ROG XG Mobile | Sonnet eGFX Breakaway Box 550 |
|---|---|---|
| Amazon | View on Amazon |
Disclaimer: The price and specification of the given product may differ from the actual product. Please confirm on the retailer's website before buying.
Verdict
ASUS ROG XG Mobile
8.5 / 10 Expert Rating
Exceptional performance and portability for its narrow compatibility list, but the closed ecosystem and steep price limit it to committed ROG Flow owners.
Sonnet eGFX Breakaway Box 550
6 / 10 Expert Rating
A solid early Sonnet box, but the 650 offers more headroom for little extra cost.
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