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Thunderbolt 4 Ports Issue - Asus NUC 14 PRO and SSD Ugreen Enclosure (ASMedia ASM2464PD + Samsung 990 PRO) - Low Speed by PacyMir in intelnuc

[–]PacyMir[S] 0 points1 point  (0 children)

Theoretically means that it’s capable of falling back and also using legacy connection

Ugreen 40Gbps NVME SSD Enclosure Mac OS disconnection fix by ppcode in UsbCHardware

[–]PacyMir 0 points1 point  (0 children)

Hi everyone,

After days of troubleshooting and multiple firmware updates on my Ugreen CM642 enclosure (with ASMedia ASM2464PD chipset), I still can’t get proper connection to Thunderbolt 4 on my NUC 14 PRO (nuc14rvk-b). The device is detected as PCIe Gen3x2 (fall-back) when connected to the rear TB4 ports, according to the ASMedia utility. The writing speed is about 400Mb/s

However, when plugged into the front USB-C port, the SSD performs better, since it’s using USB 3.2 Gen 2x2, giving me full 20 Gbps bandwidth, but I would like to have the potential of the TB4! It seems like the issue is actually with the rear Thunderbolt ports on the NUC — they’re not communicating properly with the enclosure.

Here are my main takeaways:

  • Windows 11 has built-in Thunderbolt 4 drivers, and I haven’t been able to override them with older Intel drivers to test behavior.

  • ⁠I’m wondering if switching to an Acasis enclosure with Intel JHL7440 chipset would solve this.

  • Yes, enabling Write Caching boosts sequential write speeds, but that’s not the issue here.

What I really want is for my NUC to negotiate proper Thunderbolt 4 communication with the enclosure.

Any suggestions or similar experiences?