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Sonnet eGFX Breakaway Box 350 vs UGREEN LinkStation eGPU Dock: Comparison

Sonnet eGFX Breakaway Box 350 and UGREEN LinkStation eGPU Dock separate most on max gpu length: Sonnet eGFX Breakaway Box 350 at 220, UGREEN LinkStation eGPU Dock at 4090, 95% in favour of UGREEN LinkStation eGPU Dock. Host Power Delivery splits them by another 73%, this time favouring Sonnet eGFX Breakaway Box 350.

Sonnet eGFX Breakaway Box 350 (Thunderbolt 3 / 350W PSU / Single-Slot GPU / Ultra-Low-Noise Fan / Compact)
SonnetSonnet eGFX Breakaway Box 350
UGREEN LinkStation eGPU Dock (OCuLink 64Gbps + USB4 40Gbps / 850W ATX 3.1 Gold PSU / RTX 50 Founders Edition-Inspired Design)
UGREENUGREEN LinkStation eGPU Dock

Specs

Specification
Sonnet eGFX Breakaway Box 350 (Thunderbolt 3 / 350W PSU / Single-Slot GPU / Ultra-Low-Noise Fan / Compact)
Sonnet eGFX Breakaway Box 350
UGREEN LinkStation eGPU Dock (OCuLink 64Gbps + USB4 40Gbps / 850W ATX 3.1 Gold PSU / RTX 50 Founders Edition-Inspired Design)
UGREEN LinkStation eGPU Dock
Connection StandardThunderbolt 3OCuLink (64 Gbps) and USB4 (40 Gbps) dual connectivity
BrandSonnetUGREEN
Extra PortsNone onboard beyond the GPU's own outputsPartially open metal chassis for airflow; styled after RTX 50-series Founders Edition cards
PSU Wattage350-59%850
Host Power Delivery154-73%
Max GPU Length220-95%4090
Cooling TypeActive, ultra-low-noise Noctua fanActive fan plus open-frame chassis ventilation
ModeleGFX Breakaway Box 350CM980 LinkStation eGPU Dock
PriceLaunched around $299 (2017)Launched around $269-$299 (2025)

Price comparison

RetailerSonnet eGFX Breakaway Box 350UGREEN LinkStation eGPU Dock
Full CompassView on Full Compass

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

Sonnet eGFX Breakaway Box 350

6 / 10 Expert Rating

A niche but well-executed pick for single-slot cards and quiet operation, not for gaming-class GPUs.

UGREEN LinkStation eGPU Dock

7.5 / 10 Expert Rating

A strong-value, high-wattage dual-connectivity dock from a large, well-established accessories brand — a serious new competitor in the OCuLink space.

More comparisons in External GPU Enclosures