The left-side Thunderbolt 3 ports attach to x4 PCI Express Root Port #5 – 9D14. Therefore the right-side Thunderbolt 3 ports on these newer 13″ MacBook Pros have full x4 PCIe bandwidth. 2018 & 2019 13″ models use Intel 8th generation quad-core U-processors that provides more PCIe lanes. This is due to the x2 PCI Express Root Port #9 – 9D18 to which these ports attach. Apple Thunderbolt 3 support article states that the right-side Thunderbolt 3 ports on the 2016 & 2017 13″ Touch Bar MacBook Pro have lower bandwidth than the left-side ports. All PCIe lanes are routed through the platform controller hub (PCH). Prior to the 2020 13″ MacBook Pros which use Intel Ice Lake processors (on-die Titan Ridge Thunderbolt 3 controller) all ULV-processor Macs have no direct Thunderbolt 3 to CPU connection. * Indicates a Mac with discrete graphics card as standard equipment MacBook Pro (15-inch, T2 Chip, Mid 2018) * MacBook Air (13-inch, T2 Chip, Late 2018) MacBook Pro (15-inch, T2 Chip, Mid 2019) *
MacBook Pro (16-inch, T2 Chip, Late 2019) * MacBook Air (13-inch, T2 Chip, Early 2020) Here’s the list of Thunderbolt 3 Macs that can work with eGPU in Boot Camp. They account for 16 total PCIe lanes directly off the CPU. The x4 PCI Express Controller connects to the right-side USB-C/Thunderbolt 3 ports (uses 4 PCIe lanes). The x8 PCI Express Controller connects to the left-side USB-C/Thunderbolt 3 ports (uses 4 PCIe lanes). The x16 PCI Express Controller connects to the Radeon Pro dGPU (uses 8 PCIe lanes). For example we used HWiNFO64 to check the arrangement of PCIe controllers and lane allocation on a Late 2016 15″ MacBook Pro (same as 2017 to 2019 model). Prior to setting up an external GPU, it’s a good idea to identify the routing of the PCIe connection over Thunderbolt 3 for your host Mac computer to learn about its capabilities. Therefore the ideal Boot Camp eGPU environment is an Intel iGPU-only Mac.Ģ018 15″ Macbook Pro + Radeon VII eGPU – Windows Graphics Settings Win10 1803+ provides manual graphics switching per app/game through Graphics Settings. In a Mac that has an AMD discrete graphics card and no functional iGPU, you would need Windor newer. AMD XConnect/Nvidia Optimus provides internal display loopback acceleration through the Intel iGPU with a Radeon/GeForce eGPU.
In order for automatic graphics switching to work, the crucial prerequisite is the Intel integrated graphics card.
Forum member Sky11 explained the three modes in Windows 10 (AMD XConnect, Nvidia Optimus, and Microsoft Hybrid Graphics) in this post. Let’s discuss graphics switching in Windows briefly. Razer Core X Chroma + RX Vega 64 LC + MacBook Pro + 49″ and 5K Monitors
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