Even higher transfer rates are possible with the asymmetric mode of up to 120 Gb/s in one direction (and up to 40 Gb/s in the opposite direction), which is intended for displays with a USB-C connection, enabling higher resolutions such as 8K and refresh rates of more than 60 Hertz as well as HDR. This is of particular interest to PC gamers and cinema fans.
USB 4 2.0 also doubles data transfer to other protocols from 10 to 20 GBit/s (USB 3.2 tunneling). Compatibility with USB 2.0, 3.2 and 4.1 as well as DP 2.1 and PCIe 4.0 is also guaranteed. The same applies to the maximum charging power of 240 watts already adopted in the USB Power Delivery (USB-DP) .
Not so great: As with USB 3, the USB-IF standardization committee makes the same mistake with USB 4 and combines different speeds under the new standard, such as USB 4 Gen 2×2 with up to 20 Gbit/s, USB 4 Gen 3× 2 with up to 40 Gbit/s and USB 4.2 with up to 80 Gbit/s. This makes it very confusing for end customers when the first products with USB 4 Version 2.0 are to come onto the market in 2024.
USB 4 Version 2.0: Triple Speed To 120 Gbit/S
USB 4 will bring a number of improvements compared to USB 3.2. USB 4 is based on the Thunderbolt architecture, which doubles the bandwidth of current USB technology, enabling 40 Gbps and handling multiple data and display protocols simultaneously.
Thankfully nothing changes physically, so while the underlying technology is different, USB-4 cables and ports look exactly like USB-C. USB 4 will, of course, be able to boast data transfer speeds equivalent to the Intel Thunderbolt 3 version of USB-C.
How is USB 4 different from USB 3.2 and USB 2?
- Up to 40Gbps data transfer speed over dual-lane cables to match Thunderbolt 3 speeds
- Better video performance thanks to technology that intelligently allocates resources based on transfer needs
- Thunderbolt 3 compatible depending on how USB 4 technology is implemented.
- Uses Type-C ports
- Backward compatible to USB 3.2, USB 2 and Thunderbolt 3
What USB-C versions are there?
- Superspeed USB aka USB 3.1 Gen 1 aka USB 3.2 1:5 Gbps
- Superspeed USB 10 Gbps aka USB 3.1 Gen 2 aka USB 3.2 2 2: 10 Gbps
- Superspeed USB 20 Gbps aka USB 3.2 2×2: 20 Gbps
- Thunderbolt 3: 40 Gbps
- USB4 (coming 2020): 40 Gbps
USB 4 and Thunderbolt 3 compatibility
Intel, the developer and owner of the Thunderbolt 3 protocol, has made it available to the USB Promoter Group for USB 4 to be compatible with Thunderbolt 3 devices. While this is good news for consumers in general, manufacturers are not required to include Thunderbolt 3 functionality in their USB4 specifications, so you could end up with a USB4-capable device that doesn’t support Thunderbolt 3 is compatible. As always, it is important to check the exact specification of the device before purchasing it.
While the promised 40Gbps transfer speed looks great on paper, not every USB device will be able to reach that speed. As a result, USB4 devices may need to slow down to accommodate the hardware they are connected to. USB4 will be available in three speeds – 10Gbps, 20Gbps and 40Gbps – and it’s safe to assume that the lower transfer speeds will apply to smaller and less expensive devices.
Intelligent bandwidth sharing
USB-C introduced a feature called “alternate mode” that allows for Displayport and HDMI input through a USB-C port. However, current technology doesn’t allow for an efficient allocation of resources when you’re streaming data and video at the same time – bandwidth is shared 50 percent between the two data streams.
USB4 intelligently allocates resources to video and data streams as needed. So if you’re streaming 4k video and transferring files at the same time, the technology will balance the demands so that both streams work smoothly.
USB 4 power delivery
Only certain USB-C ports support USB Power Delivery (USB-PD) , which is a requirement for charging some devices, including laptops. USB-4 devices and ports support USB-PD up to 100 watts by default, although no charger can deliver nearly that much power yet.
USB 4 is also backwards compatible with USB 3 and 2 devices, but speeds are limited to the older versions. A USB 4 external drive will not achieve USB 4 speeds when connected to a device through a USB 2 or 3 port.
This article has been published on the website : pcwelt.de