Doesn't thunderbolt require four PCIe lanes? Plus the only thunderbolt cards I've seen also require a dedicated thunderbolt header on the (x86) motherboard. Neither of which the Pi5 has.
Then there's the issue of drivers. For both the thunderbolt card and the eGPU.
Performance wise, you'll likely only see one eighth of what you might expect. One lane instead of four split between two devices. And that'll be reduced further if the thunderbolt card needs gen 3 or gen 4 PCIe speeds.
If you're going to go ahead with this, get a thunderbolt card working first then work on the eGPU.
Then there's the issue of drivers. For both the thunderbolt card and the eGPU.
Performance wise, you'll likely only see one eighth of what you might expect. One lane instead of four split between two devices. And that'll be reduced further if the thunderbolt card needs gen 3 or gen 4 PCIe speeds.
If you're going to go ahead with this, get a thunderbolt card working first then work on the eGPU.
Statistics: Posted by thagrol — Sun Jun 22, 2025 12:08 pm