A totally 'off the wall' option...

Had AliEx link sent to me for external chassis to take ~450 W PSU and a BIG graphics card, the latter linked to lap-top's PCIEx mini-slot where network card usually lives.

( Spin-off from crypto-mining rigs ??)

Bunch of gotchas: Laptop needs accessible mini-slot, sundry compatibility issues, you'd need a USB-to-network adapter in place of the pulled mini-card etc etc...

Upside, you could probably test with a 'basic' GPU before buying what often resembles a hover-drone...