I've gone P6T Deluxe > Biostar X58 > X58 UD5.
To be honest I'm not very impressed with the UD5, the voltage droop is horrific compared to both the Asus/Biostar, even with Loadline Calibration enabled it's worse than the other two put together.
Regarding support I can't say as I've not used either.
To be honest I'm not very impressed with the UD5, the voltage droop is horrific compared to both the Asus/Biostar, even with Loadline Calibration enabled it's worse than the other two put together.

Regarding support I can't say as I've not used either.