That would make a total of 6 BUS, using each 4-lane of PCIe 3.0. if you connect too many Thunderbolt devices on your Mac (specially if you have 2 x Vega II (Duo), which add 8 connectors (4 BUS)).if you have too many PCIe cards inside the Mac, you may not have enough PCIe bandwidth to drive the additional M|Family device.Each Thunderbolt to which at least one device is connected will allocate 4 lanes of PCIe3.Īnd thus it is important to check the "Expansion Slot Utility" every time you connect a new device, in order to make sure that it will have enough bandwidth. It is important to note that Thunderbolt uses PCIe bandwidth. AMD Radeon Pro Vega II Duo: 4 thunderbolt ports (2 BUS)įor all the cards that have Thunderbolt ports, the BUS are grouped as follows:Ībout PCIe usage and "Expansion Slot Utility".AMD Radeon Pro Vega II: 4 thunderbolt ports (2 BUS).AMD Radeon Pro W5700X: 4 thunderbolt ports (2 BUS).AMD Radeon Pro 580X: No external Thunderbolt ports.These can be used either to connect Thunderbolt displays, or any Thunderbolt device. Some of the graphics cards that can be purchased with the Mac Pro can add Thunderbolt ports. 2 connectors (1 BUS) at the top of the Mac Pro (these are the only Thunderbolt ports that can not be removed and will always be there):.2 connectors (1 BUS) at the back of the Mac Pro (these ports are on a PCIe card so they could in theory be removed as well):.If you don't consider the graphics cards, the Mac Pro comes with 4 Thunderbolt ports: But what's important is not the BUS number, but to know that the Thunderbolt ports go by pairs, as there are 2 ports per BUS. Note that we indicate BUS numbers in our screenshots below, but these may vary depending on your configuration. Indeed some of the Graphics cards can add more Thunderbolt ports and controllers. The 2019 Mac Pro can have different Thunderbolt port and controllers (or BUS) numbers. But for best results, you should not connect anything else on the other port as because there is only one controller, the bandwidth is shared between the 2 ports. You can plug in your M|Family device to any of the 2 Thunderbolt port. The 2020 intel iMac 27" come with 2 x Thunderbolt 3 ports, and only 1 controller (or BUS). You can plug in your M|Family device to any of the 2 Thunderbolt Controller/BUS, as each connector has its own BUS, there should be no impact on performances if you connect something else on the other port. Recommended configuration for the M|Family
All the M1 computers currently come with 2 x Thunderbolt 4 ports, and 2 controllers (or BUS).
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