As of May 2010, the 10G-Base Ethernet (10GbE) firmware available is rev 2.7.0 of the firmware. It’s testing 10GbE firmware for the A0 Infiniband chip, which found on rev. 1.x of the X8DTT-IBQF motherboard only. The firmware itself is not officially supported.
Please check with Tech Support for the latest firmware and the availability of the firmware for B0 IB chip (X8DTT-IBQF Rev 2.x).