Biostar TA790GX XE and X6 support?

[Petex]

Hi,
I am trying to figure out if this board supports Thuban X6 and perhaps someone knows this? (I asked Biostar Email support, but they do not response )

The thing is that this (unoffical?) Biostar-Dealerpage claims there is X6 support:
http://biostar-sme.com/menu/ta790gx-xe.htm
But the offical Biostar Page did not mention any X6 support:
http://www.biostar.com.tw/app/en/mb/cpu_...p?S_ID=375
"Offical" CPU supports ends at the old C2 stepping X4 955 if it seems the Board has no dual power plane design.

My current Bios is an older 09/28/2009 Version A78CM928.BS
I putted a X4 955 (C3 Stepping) and the Board only booted @800Mhz. But it works to change the multiplier in the Bios and the X4 works fine @3.8Ghz.

So, if a dual plane X4 works - did this mean a X6 (T1055) could perhaps also work? Here is the "newest" Bios: http://www.biostar.com.tw/app/en/mb/bios.php?S_ID=375
How to figure out if this Bios has any X6 support?

thx. Peter