ACC

I don't know the answer to your ACC question, but what part of your build list cannot be listed.

Raidmax Smilodon case Phenom II x3 720 4GB DDR2 800 Gigabyte MA790GP-UD4h WD Blue 640GB HDD LG GH22 multi drive Raidmax 500 Watt psu No video card yet(dont ask)
vista premium 64 , look familiar?

I think you're in the right place for your question, I just don't the answer but hopefully some wise old soul will chime in soon.

Assuming that

A) It boots fiine with ACC turned off and

B) you've verified you have a version of the BIOS that will perform unlocks

I would say yes, your 4th core is kaput.

You should be OK, I have not used Gigabytes flash utility since way back when I had a Socket A rig with a dual BIOS thingy (technical term) and it was good then so I can't see having got worse.

Better doing it from DOS mode, by using either a floppy or usb stick or maybe a cd. Why? Because it is more safe in Windows there are many things that can ruin the flash and if your flash is ruined then you will need to either reflash or get a new bios chip.

I dont know how to do it either with a usb or a cd . I dont have a floppy. I see a bios flash option on the Gigabyte website though. Man i dont know. Maybe i should just leave it be. I'm not having any problems but i sure do want to try and unlock that fourth core.

Well a BIOS update will NOT help your unlocking potential. Newer BIOSes have had fixes written in to prevent core unlocking.

Big sweaty ones !!! Is there anything else i can try to unlock it? I think i am just gonna leave my bios alone for now. If i turn to auto and it doesnt work can i just turn it off to go back to where it was?

No, not certain. Is there a way to find out ? Seems like i have read of it being done on the FX-UD5P boards though.

Did they mention which BIOS they had? Theres a possibility that F2 was the initial AM3 compatability BIOS and would therefore have the unlocking ability.

You can try to unlock you X3 720 by a bios setting called "Advanced Clock calibration"
Set it "Per Core" With a setting of "-2" per individual core. If that doesn't work try "0" and try again.
Play with the settings. And torture test with Prime95 for stability.
If you can get it to work stable you are a lucky man. Mine unlocked but failed the stability test @ default speed.
If it won't even boot you core Is probably defective as such and you will have to set your setting back to disabled to reset. I unlocked mine with a MA790FXT-UD5P. With the F2 according to Gigabites Bios info for you mobo it should be possible to unlock your core, but I am not aware of any reports regarding attempts with your board.
The X3 720 is a great overclocker with setting "Advanced Clock calibration" to disabled. And is a fine processor for it's price.

With the F2 according to Gigabites Bios info for you mobo it should be possible to unlock your core.

Good luck

If you hit Ctrl & F1 after you enter your bios you will the pc health move to the right side and it will be under M.I.T.

Yes. CTRL+F1 on the first bios screen. Then hit enter on the M.I.T. ACC will be the first choice.

yea, i can see ACC, but does that mean i have F2 or F3? how do i know my BIOS?

uh, my bios is F3, can i unlock or no?

how exactly do you "downdate" back to F2, if F3 doesn't work?
tried googling it, not getting any specifics, does anyone know if F3 can unlock it or is F2B the only one? if so, how do you do an downgrade?

Its the same process as doing an upgrade, you just flash with the F2 bios.