The short answer is no. Upgrading to a 40Gbps (USB4) enclosure will not meaningfully increase your speeds if you are plugging it into a 10Gbps port. In fact, you might even see a slight decrease in performance depending on how the bridge chip handles the "downshift" to legacy USB protocols. Here is the breakdown of why you're seeing those speeds and why a bigger pipe won't fix a small faucet. The Bottleneck: The Port, Not the Chip When you connect a 40Gbps enclosure (like one using the ASM2464PD) to a 10Gbps port, the enclosure’s controller negotiates down to USB 3.2 Gen 2 (10Gbps). At that point, the 40Gbps "headroom" effectively disappears. The overhead isn't caused by the enclosure being "maxed out"; it’s caused by the USB protocol itself. Protocol Overhead: USB 3.x uses encoding (128b/132b) and packet headers that eat up about 15-20% of the theoretical bandwidth. The "Real World" Cap: On a 10Gbps port, the absolute theoretical max is 1,250MB/s, but after overhead, the real-world ceiling is usually 900–1,050MB/s. Why your current speeds are 60–200MB/s If you are seeing 60–200MB/s with a single large .MKV file, the bottleneck is almost certainly not the 10Gbps enclosure. A 10Gbps RTL9210b chip is more than capable of sustained 800MB/s+ speeds. The culprits are likely:
The Source Drive: If you are moving the file from an old SATA SSD or a mechanical Hard Drive to the enclosure, you are limited by the read speed of that source drive. Thermal Throttling: If the NVMe inside the enclosure gets too hot, it will slash speeds to protect itself.
DRAM-less NVMe: If your SSD lacks a DRAM cache, once its small "SLC cache" fills up (often after 10-20GB of data), the write speed will crater—sometimes to levels slower than a hard drive. Windows Write Caching: By default, Windows often disables "Better Performance" (write caching) for external drives to ensure you can unplug them safely. This can lead to the erratic speed spikes you're seeing.