Hi Gunnar
I recieved the motherboard and new Phenom II on friday and set about getting it up and running with the following set up
Motherboard - Gigabyte GA-MA790XT-UD4P
CPU - AMD Phenom II X4 Quad Core 955 Black Edition 3.2Ghz
Cooling - Gelid Silent Spirit CPU Cooler
Memory - Corsair XMS3 DHX 4Gb (2x2Gb) DDR3 1600C9DHX
Graphics - NVIDIA GeForce 8800 GTX
Power - Tagan TG700-U25
Disk 1 - Seagare Barracuda ST380817AS
Disk 2 - Seagate Barracuda ST3200822A8
Disk 3 - Samsung HD103UJ
Display 1 - Samsung SyncMaster 2232BW
Display 2 - LG Flatron L1720B
Operating System - Windows XP 32Bit SP3
Initial tests were quite promising until I determined thatthe reported CPU speed was only 800Mhx instead of 3200Mhz

This I found to be as a result of the board being sent to me with a BIOS version of F3, checking Gigabyte CPU Support List for the MB this should be F4g in order to fully support the Phenom
I downloaded the recommended BIOS, mmade a backup of the original and used the recommended procedure of Q-Flash from the BIOS menu
All indications showed that the flash was successful and no errors showed
I then powered down the system and tried to power back up
This is where it hit the fan!!

No POST messages....nada...nothing!!
Reduced the configuration to a basic graphics card and nothing and still Nothing!
Outcome is a total failure and my suggestion would be to wait until I get a response from Gigabyte support and/or OC
Cheers
Stirling