![]() ![]() Thunderbolt 1 eGPUs are well outside the norm. And the same 15% penalty for Thunderbolt 2 and 3 as well, as far as I remember. You will spend a total amount of money for an eGPU enclosure and graphics card that will approach the cost of simply buying a new M1 Mac…which will probably beat every card on that list. You will spend hours finding the right hacks, and on troubleshooting if the unsupported configuration does not work right. They will know the special hacks needed to get it to work, and if any performance increase is worth doing. If you decide you must continue and you do not receive a good answer here, better places for you to look are:īoth of those forums have users with actual experience building Thunderbolt 1 eGPU systems. You can attempt it, but go in knowing that it is unsupported with no official retail solutions available since they are all built around Thunderbolt 3. I think it’s around 15% which would give you only 7 or 8 gigabits/second effective bandwidth. Remember there is overhead involved that costs a performance penalty even if not returning to the internal mointor. When the eGPU support was finalized, only Thunderbolt 3 (40Gbps) was supported Apple decided that the beta test period revealed that Thunderbolt 2 did not deliver a good enough experience. They started with Thunderbolt 2 and 3 during the beta period. When Apple started adding official macOS support for eGPUs, they did not include Thunderbolt 1. ![]()
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