Thunderbolt 3 Supported?

[MN_T]

Hello - I have a custom-ordered Spectre x360 from about 4 years ago, model 15t-df100 CTO, product number 5ZV29AV, and it has been updated some time ago from the original Win10pro to Win11Pro.  This is a model that supplies either 1 Thunderbolt port and 1 USB Type-C port, or two actual Thunderbolt ports, according to the on-line Manual - and there are no markings on the computer at all to indicate a specific port type on either of my existing ports, which both physically appear as USB Type-C ports.

So: is there any way to positively determine that both ports are Thunderbolt ports, outside of purchasing a Thunderbolt device and trying it in each port for connectivity?

And: is there any way to definitively identify that these will support Thunderbolt 3?  I am looking into the purchase of a $3k audio device that only connects with Thunderbolt 3 or higher and I would like to verify my systems' capability with actual documentation/proof rather than trying and possibly failing......  

Let me know if you can assist please - thanks!

[banhien]

@MN_T 

15t-df100 CTO, is a CTO machine, we can't get its REAL specs online. But it should have same ports as the following machine

                HP Spectre x360 - 15-df1033dx

The answer is yes, it has 2 USB 3.1 Gen 2 Type-C™ with Thunderbolt™ 3 (40 Gb/s signaling rate, Power Delivery 3.0, DisplayPort™ 1.4, HP Sleep and Charge) ports.

Regards.