Another major improvement is that TB now supports Thunderbolt Alternate Mode USB hubs (inchMulti-port Accessory Architectureinch), and not just daisy chaining. Those hubs are backwards compatible with Thunderbolt 3 devices and can be backwards compatible with Thunderbolt 3 hosts (Titan Ridge only, with Alpine Ridge the additional downstream ports get downgraded to USB3). The maximum bandwidth remains at 40 Gbit/s.
DisplayPort Alt Mode 2.0: USB4 supports DisplayPort 2.0 over its alternative mode. DisplayPort 2.0 can support 8K resolution at 60 Hz with HDR10 color. DisplayPort 2.0 can use up to 80 Gbps, which is double the amount available to USB data, because it sends all the data in one direction (to the monitor) and can thus use all eight data lanes at once.








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