Surprise Surprise Gigabyte answered with this;
Answer - 774226
Answer : Dear Customer,
Yes, you may load Ubuntu. Most of the drivers will already be included with the latest Ubuntu version.
Thank you for choosing Gigabyte products
Question - 774226
From : [ enviropond@verizon.net ]
Sent : 6/21/2009 12:39
Question : I am considering buying the above board for my new home build; however there is a remark reguarding Linux chipset on the info sheet. I just need to know if I can load Ubuntu [Linux] as a stand alone OS then get the chipsets via AMD?
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Model Name : GA-MA790GP-UD4H(rev. 1.0)
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M/B Rev : 1.0
BIOS Ver : *****
Serial No. :
Purchase Dealer : New Egg
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VGA Brand : ATi Model : onboard MB
CPU Brand : AMD Model : PIIX3 Speed : 2.8
Operation System : Linux SP :
Memory Brand : OCZ Type : DDRII
Memory Size : 4 GB Speed : 1200
Power Supply : 600 W
Phenom II X3 @2.8 GHz
PC2 9600 1.8v 4Gb
Western Digital RE3 250GB in RAID 1
Ubuntu 9.04 OS 32 bit
Now that is the usual ambiguous response and it puts it on the Jackalope but I have to consider the information I found on Ubuntu Wiki {yes PC-Guru I have been off researching

}. The UWiki has no data on any AMD socket AM2+ or AM3 boards by Gigi; and it goes without saying that I do know a little about that [my board selection in an AM2+ AM3 capable socket] but even AMD can not keep up with the number of components using AMD/ATI parts. You know the engineering testing and cert..
I appreciate your answer PC-Guru and I'm researching the RAID 1 stuff before posting that. I'll try to add to this thread as I learn so others may benefit
I feel your pain with the MS dependency and am glad I have yet to cross that line cause I really intend to fire MS with my new build and devote energy to learning Linux so I can contribute to the project
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Ga-990XA-UD3, Phenom II 970 BLK @3.5 GHz, 16 GB DDR3 1600 G.Skill Sniper, WD 1.5 TB Black, ATI FirPro V4800 running on Kubuntu 64-bit