Jeff Greenburg at OWC has an article on tests they ran on an EGPU on an Intel Mac, and what it can provide.
And an EGPU will boost an older Intel mac, but of course it isn’t a new Apple Silicon Mac, so you might want to save up for that.
So Apple and Blackmagic have released an upgraded thunderbolt 3 EGPU, the Pro with an AMD Vega 56 for $1199. Should be great for MacBook Pro’s and even the new MacBook Air’s.
BlackMagic has worked with Apple to create an thunderbolt 3 eGPU with a Radeon Pro 580 in it. It is not upgradeable, but has an HDMI and four usb 3.1 connections and a thunberbolt passthrough as well as 85W of power. It is $699 and sells from Apple to work with their laptops.
Very cool, though I think they might have missed an opportunity in not combining it with a Decklink, Intensity or UltraStudio for playback to an external monitor. Even if it used 2 Thunderbolt connectors I think the addition of at least a playback card would have made this a must have solution.