For the X8DTU rev 1.3 to support the Xeon 5600 series CPU, please ensure that the latest bios is flashed. The latest bios is available from this link: http://www.supermicro.com/products/motherboard/QPI/5500/X8DTU.cfm
The only feature that would not be availabe with the rev 1.3 motherboard is the Intel TXT feature as there is not TPM header available.