![]() ![]() Here's a question: Can a Thunderbolt 3 device connected to a Thunderbolt 2 host perform better than a Thunderbolt 2 device connected to the same host? The Thunderbolt 3 device will be using PCIe 3.0 so maybe it can use more of the Thunderbolt 2 bandwidth? Probably not, since the host is still limited to PCIe 2.0. The rest of the Thunderbolt 2 bandwidth can be used by DisplayPort (priority is DisplayPort, then PCIe can use whatever is left over up to its max). The Thunderbolt controller also has two DisplayPort inputs. PCIe is just one of the inputs to the Thunderbolt controller. With PCIe overhead, you can expect to get about 80% of that. Click to expand.Thunderbolt 2 = 20 Gbps = 2500 MB/sīut Thunderbolt 2 uses PCIe 2.0 x4 = 5 GT/s x 4 x 8b/10b = 2000 MB/s.
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