Can I use a longer thunderbolt replacement cable?

I'll be using the Blackmagic eGPU Pro with 27" iMac 4.2GHz quad-core 7th-generation Intel Core i7 processor, 64GB 2400MHz DDR4, 2TB Fusion Drive
Radeon Pro 580 with 8GB video memory

Blackmagic eGPU Pro

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    Short answer, yes. However if you are using a Thunderbolt 3 cable longer than apple's 0.8m you will need to make sure it is an active Thunderbolt cable. Most of the short Thunderbolt 3 cables are shorter than 0.8m [actually details list most are under 0.5m] because they are passive cables and lose the ability to handle the full Thunderbolt 3 data transfer rate if they go longer. [Full 40Gbps vs 20Gbps]

    There is a lot of information out on the web about what an active vs. passive Thunderbolt 3 cable, but whatever cable you use it will need to be a true Thunderbolt 3 cable, not a USB-C cable and not an apple charging cable.

    How that answers your question.


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