Those drivers are included in the newest DSS V6 build 5626. This information can be found in the readme_5626.txt:

UPDATED:
- Updated drivers for Intel's Ethernet cards 10Gb/s (ixgbe - v3.3.9-NAPI)
- Updated drivers for Intel's Ethernet cards 1Gb/s (e1000e - v1.3.10a-NAPI, e1000 - v8.0.30-NAPI)

BR,
Tomek