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www.pcworld.com/article/703578/usb4-support-amd-ryzen-6000-laptop.html
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eGPU on AMD at last!
Besides the ability to achieve high-speed external drive performance on a non-Intel or non-Apple laptop, the most exciting capability USB4 will enable on AMD laptops is the ability to use an external GPU enclosure. To test that I grabbed an Asus XG Station Pro Thunderbolt 3 cabinet, installed an older GeForce GTX 1070 Ti in it, and plugged it in. The eGPU cabinet showed up in Windows and installed drivers from Windows Update.
Obviously one reason to use an eGPU on a slim laptop is for the performance increase, so I ran a few quick benchmarks to look at what's possible. Gaming is probably what people think of first so I ran the synthetic 3DMark Time Spy test, which is nearly a pure graphics-focused test. As impressive as AMD's RDNA2 IGP is, it's still not on equal footing with a discrete GPU, as you can see by the 5-year-old GeForce GTX 1070 Ti's performance advantage of 174 percent.
Not everyone uses an external GPU for gaming, so I also ran Puget System's Pugetbench Premiere Pro benchmark on the laptop and saw a healthy 46 percent performance improvement with the external GeForce installed. This is only in the overall score, which mixes in the GPU and export performance with the entire score and I suspect the sub-scores details would show the eGPU with an even bigger edge.
This, of course, isn't about how much better even an elderly GPU is over the best IGP available today—it's about the fact that you can finally, finally get an eGPU on an AMD laptop without using proprietary systems that are locked to a single laptop. That's been a luxury only Intel laptops with Thunderbolt 3 and Thunderbolt 4 have been able to enjoy, now opened up to AMD laptops with USB4.
Asus' ZenBook 13 S OLED performance running a Thunderbolt 3 eGPU over USB4
With USB4 on Ryzen 6000, you can finally use an external GPU without any proprietary hardware needed.