![]() In early implementations, you'd better have the eGPU hooked up before you boot. ![]() What Apple's fixed and changed along the way That changed when Apple announced High Sierra, and made some changes to how macOS deals with it. It also needed the user to make some concessions about limitations. As a general rule, putting a PCI-E graphics card into a Thunderbolt 3 enclosure and connecting it to a Thunderbolt 3 host system will hit you for about 10 percent of any given card's maximum potential performance-wise except for the newest, highest-end cards under massive load, where the losses jump to about 30 percent.Ĭonnecting through Apple's $59 bi-directional Thunderbolt 3 to Thunderbolt 2 adapter, Thunderbolt 2 will chop off about 20 percent more, and Thunderbolt 1 will kill nearly 50 percent.īefore High Sierra, using an eGPU took a series of relatively simple hacks to enable the technology. We're not going to go deep into what we've discovered about eGPUs and Thunderbolt 3 over the last few years here.
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