Cloudzat OCuLink & eGPU Intelligence
eGPU Power Supply Calculator
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 | |
|---|---|---|---|---|---|---|
 ADTLINKADT-Link PCIe 5.0/4.0 Oculink SFF-8611 to PCI Express x16 eGPU Adapter for GPD Win Max2 External Graphics Card (K993G-BK7-30cm) |
Egpu Dock | OCuLink x4 128Gbps class |
500W | New | $77.80 | View on Amazon |
ADTLINKADT-Link PCIe 5.0/4.0 Oculink SFF-8611 to PCI Express x16 eGPU Adapter for GPD Win Max2 External Graphics Card (K993G-BK7-50cm) |
Egpu Dock | OCuLink x4 128Gbps class |
500W | New | $79.80 | View on Amazon |
 TREBLEETTREBLEET 80Gbps eGPU Enclosure, Compatible with Thunderbolt 5 & USB4, External GPU Dock with JHL9480 Controller, Supports PD 140W Charging, Daisy Chain, DC/SFX/ATX Power Support, for Windows & Mac |
Egpu Dock | Thunderbolt 5 80Gbps class |
Separate/unknown | New | $199.99 | View on Amazon |
 RazerRazer Core X V2 External Graphics Enclosure (eGPU) |
Egpu Dock | Thunderbolt 5 80Gbps class |
Separate/unknown | New | $328.99 | View on Amazon |
RazerRazer Core X V2 - External Desktop Graphics Case for Thunderbolt Laptops - Next-Gen Thunderbolt 5 Performance - Vented Steel Housing - Supports PCIe Graphics Cards with up to 3.5 Slots | Black |
Egpu Dock | Thunderbolt 5 80Gbps class |
Separate/unknown | New | $530.61 | View on Amazon |
 PlugablePlugable Thunderbolt 5 AI eGPU Enclosure & Dock: 80Gbps, 850W PSU Included, TAA Compliant for Windows 11, NVIDIA and AMD Cards (96W Power Delivery, 2.5Gbps Ethernet, 850W PSU, USB Hub) TBT5-AI |
Egpu Dock | Thunderbolt 5 80Gbps class |
850W | New | $629.99 | View on Amazon |
 JMTJMT ADT-R29A PCIe4.0 x4 to SFF-8611/8612 OCuLink Adapter Card 64Gbps with Half and Full Height Baffle Support Chassis External |
Egpu Dock | OCuLink x4 64Gbps class |
Separate/unknown | New | $16.98 | View on Amazon |
 OwlTreePCIe 4.0 x4 64Gbps Compatible with OCuLink SFF-8612 SFF-8611 External GPU eGPU Riser Card for Mini PC |
Egpu Dock | OCuLink x4 64Gbps class |
Separate/unknown | New | $18.99 | View on Amazon |
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.