Thank you for contacting Intel.
You may use the QSFP+ Breakout Cable with Intel® QSFP+ Configuration Utility (QCU) to split the 40Gb port into 4x 10Gbps ports. This utility is included in adapter's driver. Refer to our websites below:
1. http://www.intel.com/content/dam/www/public/us/en/documents/guides/qsfp-configuration-utility-quick-... Intel® QSFP+ Configuration Utility (QCU) Quick Usage Guide
2.https://downloadcenter.intel.com/product/83950/Intel-Ethernet-Converged-Network-Adapter-XL710-Series Network Adapter Driver for PCI-E 40 Gigabit download page
Feel free to contact us again if you need further assistance.
Thanks for writing back.
Yes, you may connect an X710 Network Card to another X710 Card. The performance results may vary when speed settings are mixed. It would be best to use our twinaxial cables.NameProduct CodeIntel® Ethernet SFP+ Twinaxial Cable, 1 meterXDACBL1MIntel® Ethernet SFP+ Twinaxial Cable, 3 metersXDACBL3MIntel® Ethernet SFP+ Twinaxial Cable, 5 metersXDACBL5M
Please refer to website below for more information:
http://www.intel.com/support/network/adapter/x710/sb/CS-035281.htm Intel® Ethernet Converged Network Adapter X710 Series — Which SFP+ Modules, SFP Modules, and Cables Can I Use with the X…
Hope this is helpful.