USB4 Hard Drive Enclosure Main Control Chip

The second approach is to adopt the more costly Thunderbolt 3/4 + USB dual-controller solution. Currently, many USB4 hubs on the market still utilize this design, offering excellent stability and thermal control. Compared to USB4 hard drive enclosures using the ASM2464PD controller, these products exhibit the most stable performance on both Mac devices and Windows PCs. Because Thunderbolt 4 and USB4 are both built on the Thunderbolt 3 underlying protocol, they complement and are compatible with each other, meeting all USB4 specification requirements. As a result, devices supporting Thunderbolt 3/4 provide a superior experience, albeit at a higher product cost, leading to a higher sales price.

The following screenshot shows the speed test results from an Ankmax UC4M3 40Gbps M.2 hard drive enclosure, achieving read and write speeds of up to 3000MB/s, offering impressive performance, especially with excellent thermal control.
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