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OWC Mercury Helios 3 vs UGREEN LinkStation eGPU Dock: Comparison

OWC Mercury Helios 3 and UGREEN LinkStation eGPU Dock separate most on host power delivery: OWC Mercury Helios 3 at 85, UGREEN LinkStation eGPU Dock at 4, 95% in favour of OWC Mercury Helios 3. Max GPU Length splits them by another 93%, this time favouring UGREEN LinkStation eGPU Dock.

OWC Mercury Helios 3 (Thunderbolt 3 eGPU Enclosure / 400W PSU / Bus-Powered Charging / Predecessor to Helios FX)
OWCOWC Mercury Helios 3
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
OWC Mercury Helios 3 (Thunderbolt 3 eGPU Enclosure / 400W PSU / Bus-Powered Charging / Predecessor to Helios FX)
OWC Mercury Helios 3
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
BrandOWCUGREEN
Extra PortsNone onboard beyond the GPU's own outputsPartially open metal chassis for airflow; styled after RTX 50-series Founders Edition cards
PSU Wattage400-53%850
Host Power Delivery854-95%
Max GPU Length290-93%4090
Cooling TypeActive FanActive fan plus open-frame chassis ventilation
ModelMercury Helios 3CM980 LinkStation eGPU Dock
PriceLaunched around $299 (2018)Launched around $269-$299 (2025)

Price comparison

RetailerOWC Mercury Helios 3UGREEN LinkStation eGPU Dock
AmazonView 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

OWC Mercury Helios 3

6 / 10 Expert Rating

Solid basic Mac eGPU box, superseded by the Helios FX which OWC still actively sells.

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