OK I was able to reverse-engineer this to some degree. For R80.20 kernel version 2.6.18-92cp here are the Intel driver versions and what cards they support. Note that for ixgbe and igb the the specific version in use by Gaia is not currently shown on Intel's website as far as what NICs it supports, but the closest version I could find is shown instead which *should* be pretty close. Any Intel NIC that has a release date after the date shown for its corresponding Gaia driver will almost certainly not work.
Note that these driver versions are likely to be much newer for the new 3.10 kernel for R80.20 and the list of supported NICs will probably be longer under that kernel version.
ixgbe 3.9.15 released 3/15/2012
This driver version is not currently listed on Intel's website, but version 3.16.1 released 5/14/2013 is and supports these NICs according to Intel:
Intel® 10 Gigabit AT Server Adapter
Intel® 82598EB 10 Gigabit Ethernet Controller
Intel® 82599EB 10 Gigabit Ethernet Controller
Intel® 82599EN 10 Gigabit Ethernet Controller
Intel® 82599ES 10 Gigabit Ethernet Controller
Intel® Ethernet Controller X540-AT2
Intel® Ethernet Converged Network Adapter X520-DA1
Intel® Ethernet Converged Network Adapter X520-DA2
Intel® Ethernet Converged Network Adapter X520-LR1
Intel® Ethernet Converged Network Adapter X520-QDA1
Intel® Ethernet Converged Network Adapter X520-SR1
Intel® Ethernet Converged Network Adapter X520-SR2
Intel® Ethernet Converged Network Adapter X520-T2
Intel® Ethernet Converged Network Adapter X540-T1
Intel® Ethernet Converged Network Adapter X540-T2
Sun Dual 10GbE PCIe 2.0 FEM*
igb 4.1.2 released 10/5/2012
This driver version is not currently listed on Intel's website, but version 4.3.0 released 6/14/2013 is and supports these NICs according to Intel:
Intel® 82575EB Gigabit Ethernet Controller
Intel® 82576EB Gigabit Ethernet Controller
Intel® 82576NS Gigabit Ethernet Controller
Intel® 82580EB Gigabit Ethernet Controller
Intel® Ethernet Controller I210-AS
Intel® Ethernet Controller I210-AT
Intel® Ethernet Controller I210-CS
Intel® Ethernet Controller I210-IS
Intel® Ethernet Controller I210-IT
Intel® Ethernet Controller I350-AM2
Intel® Ethernet Controller I350-AM4
Intel® Ethernet Controller I350-BT2
Intel® Ethernet Server Adapter I210-T1
Intel® Ethernet Server Adapter I340-F4
Intel® Ethernet Server Adapter I340-T4
Intel® Ethernet Server Adapter I350-F2
Intel® Ethernet Server Adapter I350-F4
Intel® Ethernet Server Adapter I350-T2
Intel® Gigabit EF Dual Port Server Adapter
Intel® Gigabit ET Dual Port Server Adapter
Intel® Gigabit ET2 Quad Port Server Adapter
Intel® Gigabit VT Quad Port Server Adapter
i40e 1.4.25 released 4/6/2016
Actual NICs supported by this driver version according to Intel:
Intel® Ethernet Controller X710-AM2
Intel® Ethernet Controller X710-BM2
Intel® Ethernet Controller XL710-AM1
Intel® Ethernet Controller XL710-AM2
Intel® Ethernet Controller XL710-BM1
Intel® Ethernet Controller XL710-BM2
Intel® Ethernet Converged Network Adapter X710-DA2
Intel® Ethernet Converged Network Adapter X710-DA4
Intel® Ethernet Converged Network Adapter XL710-QDA1
Intel® Ethernet Converged Network Adapter XL710-QDA2
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