Have you just learned the difference between USB Gen 1
Thunderbolt was proprietary and expensive
If you're wondering why Thunderbolt 3 does not already support the USB field, the answer is the cost. Intel has developed Thunderbolt 3, and anyone who wants to use it (whether a flash drive, the port in their laptop, or a cable) must pay a license fee to get the certification. This fee increases the price of everything related to Thunderbolt, and other USB specifications are cheaper in comparison. That's why you'll find Thunderbolt in your top notch MacBook, but not in a $ 300 laptop. The cost is prohibitive, and that's just one reason why not all USB-C devices are the same.
Intel, however, wants broader acceptance of Thunderbolt, and if this is announced, it would open the specification. USB 4 came out of this drive. According to the USB Promotor Group, USB 4 will provide the same speed as Thunderbolt through the use of two 20 Gbps channels. High speeds like these make running external displays and external video cards more practical and cheaper without these licensing fees. And as usual, USB 4 is backwards compatible with USB 3.2 and USB 2.0. However, due to Intel technology, USB 4 is also backwards compatible with Thunderbolt 3.
Another benefit should be the cost of USB 4 devices. Since no licensing fee has to be paid to Intel for creating USB 4, the total cost of USB 4 products should be lower than Thunderbolt 3 devices.
Note, however, that getting these speeds means updating all your hardware. It is not enough to have a USB flash drive with a capacity of 40 Gbit / s. The port to which you connect must also comply with this ability. If you connect a USB 4 drive to a USB 3.2 2 × 2 drive, you are limited to the maximum speed of the port (and vice versa).
This is just a design specification with basic information
What we do not know is … something else. For example, Intel says it will continue to offer Thunderbolt 3 alongside USB 4, so of course it offers benefits that USB 4 does not offer. These benefits were not mentioned.
We also do not know when we will do it I will see the first USB 4 products. The final specifications for the USB-4 standard will be available by the middle of the year at the earliest and only then should manufacturers begin developing USB-4 products.
And the other thing we do not know? The final designation. If you hope that USB 4 means, do not hold your breath. The naming is often later, as it is known from USB 3.2 2 × 2, which has initially designated the USB-IF as USB 3.2. However, once all these details have been clarified and the dust settles, it may well be that the long promise that all ports are dominated by a USB-C device will finally come true
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