The ATTO ThunderLink NQ 3401 (QSFP+) and ThunderLink NQ 3402 (QSFP+) support Thunderbolt 3 (40 Gb/s) and have QSFP modules that allow your Thunderbolt 3 PC to connect to 40GbE Ethernet networks. The ThunderLink NQ 3401 (QSFP+) and ThunderLink NQ 3402 (QSFP+) have one and two ports, respectively.
If you plan to use a Windows PC with the ATTO ThunderLink NQ 3401 (QSFP+) and ThunderLink NQ 3402 (QSFP+), you should use a Thunderbolt 3 enabled PC. Thunderbolt 3 enabled PC's can vary in performance but the Windows PC's have been tested by ATTO to work with ATTO can be found here.
Thunderbolt 3 enabled Windows PC's can vary in performance due to the number PCIe Express connections hardwired into their Thunderbolt 3 ports. They can also vary in behavior due to the BIOS and Thunderbolt firmware used so make sure you check with the PC manufacturer for the latest updates available.