The Apple Thunderbolt 3 to Thunderbolt 2 Adapter works with many PC's with Thunderbolt 3 ports to allow connecting a Thunderbolt display.
I don't know if it works with the Lenova P51s. It may depend on the Thunderbolt firmware version so make sure it's up to date.
The Apple Thunderbolt 3 to Thunderbolt 2 Adapter is probably the least expensive available. The Apple adapter also has the ability to use Thunderbolt 3 devices with Thunderbolt 2 computers (most or all other adapters only allow using Thunderbolt 2 devices with Thunderbolt 3 computers).
If the Apple adapter doesn't work with your PC, then Intel has a list of other Thunderbolt 3 to Thunderbolt 2 adapters that will work. Search the Products | Thunderbolt Technology Community page.
- Answered by Joseph V from Fort Langley
- Flag as inappropriate Answer (I have an Apple Thunderbolt monitor but getting a new PC laptop that has a Thunderbolt 3 (UCB C) adapter. Will this adapter allow PC to Mac monitor?)