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Thread: Bios ACC Control




  1. #1
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    Default Bios ACC Control

    I have the GA-MA790X-UD4P MBO with bios ver. F5a and am running the X3 720 BE. I would like to activate the 4th core of the cpu but can not find the ACC control after entering the advanced chipset setting by hitting F1 at the main bios screen. No ACC control as mentioned in other posts.

    Would appreciate any guidance one may have.

    Thanks

    Tom

  2. #2
    Acebmxer's Avatar
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    Default Re: Bios ACC Control

    Quote Originally Posted by reggah View Post
    I have the GA-MA790X-UD4P MBO with bios ver. F5a and am running the X3 720 BE. I would like to activate the 4th core of the cpu but can not find the ACC control after entering the advanced chipset setting by hitting F1 at the main bios screen. No ACC control as mentioned in other posts.

    Would appreciate any guidance one may have.

    Thanks

    Tom
    I havent run any of the new amd's but i think amd disabled the core on the chip not something you can do in the bios but i could be wrong.
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  3. #3
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    Default Re: Bios ACC Control

    I think you may be correct but others have said that they have done it. Maybe they are just blowing smoke

    tD

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    Default Re: Bios ACC Control

    It is possible to unlock the 4th core on some x3's. They have to be from quite spacific batches though.

    You may have to downgrade to BIOS F4. Many board manufacturers have removed the option after pressure from AMD. AMD really don't want you to unlock that extra core, they want you to buy an x4. It may noteven be possible with your board, but check out BIOS F4 to make sure.

    I'm sure the batch codes were stated in either last months PC Format or Custom PC magazine. If I find them I'll post here.

    Remember that the core may be unlockable and work fine. It could be unlockable and be damaged, causing problems untill you disable it again, or it could be marginal and limit overclocking somewhat.
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    Default Re: Bios ACC Control

    Found the article:

    "|Not all X3's on the market have this usable fourth core, but you're in luck if you have one with a batch number starting 0904. You'll also need a 790FX based motherboard with an AMD SB750 in order to access the dormant core. The BIOS needs to be able to give you access to the Advanced Clock Calibration featur to make this possible.

    We chose a Gigabyte MA790FXT-UD5P board, although Biostar and ASRock790FX boards have the functionality too. Unfortunately though, with Gigabyte at least, the functionality has been patched out of the latest F3L BIOS. Flashing back to the F3B BIOS gave us the required functionality."

    They include before and after pictures of the BIOS, the chip used and the motherboard, as well as showing CPU-Z with the patched CPU identifying itself as having four cores and four threads.

    They benched the CPU with Far Cry 2 and X.264 encoding. Results at 2.8GHz (stock), 2.8GHz with 4 cores and OC @ 3.4GHz with 4 cores were:

    X264
    Stock : 12 FPS
    Stock unlocked: 17 FPS
    Unlocked OC: 20 FPS

    Far Cry 2
    Stock: 88 FPS
    Stock unlocked: 93 FPS
    Unlocked OC: 105 FPS

    An HD 4890 was used as the GFX card. Settings for Far Cry 2 were not specified, though by the size of the screen in the BIOS pics, I'd say the resolution was 1920x1200.

    If anyone wants a copy of the article, then PM me your e-mail address and I'll scan it. It's only two pages. Don't post your e-mail address in the forum or you may get zapped by the spam bots.
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  6. #6
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    Default Re: Bios ACC Control

    Thank for the reply. I assume I have to look directly on the cpu to find out what batch # it is from? I am currently running the X3 720be at 3.5ghz, 206 bus speed and x17 mult. I am amazed at the low cpu temp for this OC, its nice chip. I can still take the MBO back to Frys for a refund and then buy an FX board but I should check the batch # of the cpu 1st. Also, I can't find a Gigabyte Ma board with 2 x 16 pcie slots, one slot is alwasys x8. Do you know of one?

    Anyway thank you for the information, it is helpful.

    Tom Dadian

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    Default Re: Bios ACC Control

    No problem.

    The only sure way to confirm possible unlockability is to check the details stamped on the chip.

    I'm not sure of any AMD boards with twin 16x as I've not owned an AMD chip since my old X2-3800+. However, unless you plan on running two dual GPU cards in CrossfireX, there will be zero performance loss by dropping to 8x, if it's a PCIe 2.0 slot.

    Thinking logically, a for example 4870X2 would be sending and recieving twice the amount of data on the PCIe bus. If 16x doesn't effect performance with it's 2 GPU's and twice the data I/O, then a single GPU card will be unaffected by the drop to 8x. I've confirmed this by running my 4850 in the second port on my mobo, and benches, bandwidth etc are all identical.

    The only time I would insist on two 16X lanes is as said, if going Quad CF, as then dropping to 8X lanes would strangle those high throughput twin GPU beasts, making it almost pointless having two of them.

    It's up to you of course if you wish to have twin 16x, so don't take that as a rant, and a direction to definately not get what you want.

    I hope you do have an unlockable CPU. Let us know when you take your HSF off.
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  8. #8
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    Default Re: Bios ACC Control

    Quote Originally Posted by reggah View Post
    I have the GA-MA790X-UD4P MBO with bios ver. F5a and am running the X3 720 BE. I would like to activate the 4th core of the cpu but can not find the ACC control after entering the advanced chipset setting by hitting F1 at the main bios screen. No ACC control as mentioned in other posts.

    Would appreciate any guidance one may have.

    Thanks

    Tom
    It is in F4, F5A AND F5 bios.
    I know this because my MA790X-UD4P came with F4, I tried F5A and then now have F5 bios and ACC has been in all three.

  9. #9
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  10. #10
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    Default Re: Bios ACC Control

    I also have the Gigabyte MA790FXT-UD5P. Trying to unlock the 4th core, but can't find the ACC control on the bios (Ver F4). Anyone been able to access it? How did you gain access to it in the bios screen?

    Thanks

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