As i said above, no problem at all... PCIE 2.0 is the same as 2.1 from Wiki
PCI Express 2.1 supports a large proportion of the management, support, and troubleshooting systems planned for full implementation in PCI Express 3.0. However, the speed is the same as PCI Express 2.0.
The PCIE 2.1 card will operate normally on the PCIE 1.0 or 1.1 but at the full bandwidth given by the PCIE 1.0 or 1.1
Just update your Bios to the latest, and no problems will occur.