Cloudzat OCuLink & eGPU Intelligence
An eGPU power supply must cover the graphics card, dock electronics, transient spikes and connector requirements without operating continuously at its limit. This calculator produces a conservative PSU class and cable checklist.
Size the eGPU power supply
Enter card power and dock requirements before calculating.
Board power is only the starting point
Graphics cards can draw short transient loads above their average board-power rating. A suitable margin improves stability and keeps the power supply away from continuous maximum output.
The dock also consumes power
Open adapter boards use relatively little power, while enclosures with fans, USB hubs or charging features add more. Integrated eGPU products already include a matched adapter and should not be sized like an open dock.
Connector quality matters
Use the connector and cable arrangement specified by the GPU and PSU maker. Avoid improvised splitters and do not mix modular PSU cables from different power-supply models.
Oversizing has limits
A modest margin is useful, but an unnecessarily large PSU can cost more and take more space. Quality, protections and correct connectors matter more than the largest wattage number.
Current eGPU accessory catalogue
Current docks, adapters, cables and power supplies with Amazon images and prices.
| Product | Type | Interface | Power | Condition | Price | |
|---|---|---|---|---|---|---|
 PlugablePlugable Thunderbolt 5 AI eGPU Enclosure & Dock: 80Gbps, TAA Compliant |
Egpu Dock | Thunderbolt 5 80Gbps class |
850W | New | Price Options | Buy on Amazon |
 GOLDSOUNGOLDSOUN External eGPU Dock Compatible with Thunderbolt 3/4 USB4,85W PD |
Egpu Dock | Thunderbolt 4 40Gbps class |
Separate/unknown | New | Price Options | Buy on Amazon |
 OwlTreeOwlTree Graphics Card eGPU Dock for Thunderbolt 3/4 USB 4, with 60cm Cable |
Egpu Dock | Thunderbolt 4 40Gbps class |
Separate/unknown | New | Price Options | Buy on Amazon |
 NIMONIMO External Dedicated Graphics Card for Laptops & Mini PCs & Desktop, AMD RX 7600MXT, Thunderbolt 5 & OCuLink eGPU Docking Station, 8GB GDDR6, DP 2.0 / HDMI 2.1, 240W Built-in PSU |
Oculink Cable | OCuLink x4 80Gbps class |
Separate/unknown Included |
New | Price Options | Buy on Amazon |
 RGEEKOCuLink eGPU Dock |
Oculink Cable | OCuLink x4 64Gbps class |
Separate/unknown | New | Price Options | Buy on Amazon |
 OwlTreePCIe 4.0 x4 64Gbps Compatible eGPU DOCK, with OCuLink SFF-8612 8311 to PCIe x16 and SFF-8611 Male Cable, Enclosure supports Standard ATX Power and External Graphics Cards GPU for Laptop Mini PC |
Integrated Egpu RTX 4090 |
OCuLink x4 64Gbps class |
Separate/unknown Included |
New | Price Options | Buy on Amazon |
 OwlTreeOwlTree PCIe 4.0 x4 64Gbps eGPU External Graphics Cards Dock, with OCuLink SFF-8612 8311 to PCIe x16 and SFF-8611 Male Cable 50cm, Supports GPU Laptop MIni PC Standard ATX Power Supply |
Integrated Egpu RTX 4090 |
OCuLink x4 64Gbps class |
Separate/unknown Included |
New | Price Options | Buy on Amazon |
 RGEEKOCuLink eGPU Dock, SFF-8612 to PCIe x16 Adapter with 50cm OCuLink Cable |
Integrated Egpu RTX 4090 |
OCuLink x4 64Gbps class |
Separate/unknown Included |
New | Price Options | Buy on Amazon |
Amazon prices and images are refreshed on a 24-hour cycle when available. A matching listing without a current featured numeric price is shown as Price Options; check Amazon for the current offer.
Frequently asked questions
Can I use a desktop ATX PSU with an open eGPU dock?
Yes, when the dock supports standard ATX startup control and the PSU provides the required GPU connectors.
Do I need an 850W PSU for every high-end GPU?
No. Size the PSU from the card reference power, transient margin, dock load and manufacturer recommendation.
Can I reuse a modular cable from another PSU?
Do not assume compatibility. Modular pinouts can differ and may damage hardware.