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.
Here are some of the Windows PC's that have been tested by ATTO to work well with the ThunderLink NQ 3401 (QSFP+) and ThunderLink NQ 3402 (QSFP+):
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.