Some motherboards can allow you to force PCIe slots to run in gen3 mode. I don't know if that will help, but other users have suggested it might. I recommend you try it at the very least. As far as I can tell, 3.0 is not a requirement as we've had 2.0 PCIe users make it work, so if you can change the settings in the BIOS, please try that. If not, let me know and we'll try another avenue. Thank you,
-John C