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Thread: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel




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    Default GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    GA-MA78GM-S2H (rev 1.1)
    BIOS: F5 (16 Jun 2008)
    CPU: 4850e AMD Athlon64 X2 2.5GHz
    RAM: OCZ DDR2 800 MHz PC2 6400 gold 5-5-5-18 (2x2GB) (OCZ2G8004GK)
    PSU: Antec 380W (stock with case NSK2480)

    This is a new build. I've tried both this OCZ and some Corsair TWINX (same specs) and both fail to work as dual-channel. (In this case, "Fail to work" means doesn't boot.) It'll boot if the memory is in single-channel mode though. (See chart below.)

    I've tried increasing the memory voltage to 2.1v with no luck. Is it time to RMA the mobo or are there some other BIOS settings I should try for dual-channel?

    I probably wouldn't mind continuing to use the board in single-channel mode (since there's not a huge performance gain), but I don't want to keep a defective board--who knows what else will go wrong.

    Thanks for any help.


    Code:
    Testing stick A or B by itself
    +---+---+---+---+
    | + |   |   |   | boots
    |   | o |   |   | no boot
    |   |   | + |   | boots
    |   |   |   | o | no boot
    +---+---+---+---+
    
    Testing both sticks:
    +---+---+---+---+
    | A |   | B |   | boots
    |   | A |   | B | no boot
    | A | B |   |   | no boot
    |   |   | A | B | no boot
    +---+---+---+---+
    Last edited by skst; 11-27-2008 at 03:29 AM. Reason: Fixed RAM amount (not 4x4GB)

  2. #2

    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    I do not understand your diagram, sorry.

    With the GA-MA78GM-S2H I believe that to enable dual channel mode, the RAM sticks need to be in the same color slot. So DIMM0 and DIMM1 for dual channel where as normally they would be in DIMM0 and DIMM2 for dual channel.

    Hope this helps.
    Last edited by soldier; 11-27-2008 at 01:33 AM.
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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    Correct, for that board dual channel is Slots 1+2 or 3+4

    But from your single stick tests looks like slots 2 and 4 may be faulty. But with 4GB sticks you may need to for sure set some things in the bios first before one or both sticks would work properly. This is 4x4GB right 16GB?

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    Geez, I'm sorry! I've got two (2) sticks of 2GB each (2x2GB). I have no idea why I typed 4x4GB. The diagram's indicate where I'm putting one (the first grid) or two (the second grid) sticks. (I'm distinguishing between the two sticks by naming them A and B.) The + and o show where the single stick works and doesn't work, respectively.

    So, I think the main question is: Should a single stick work in any of the four slots? If so, the board is definitely bad. If a single stick doesn't necessarily have to work in slot 2 or 4, it could be BIOS settings.

    Sorry again about that. Thanks for replying.

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    Ya, I got your diagram. 2x2 eh, well that is easier!

    Yes a single stick should work in any slot, but you may need to manually set your ram voltage depending on the ram. So I would do that first before I ruled any slots bad.

    With both sticks installed you will need to increase Memory controller voltage, and set refresh to act delay (trfc) not sure what it is in your BIOS to 195ns or 327ns, you will know which is it when you see those as options. It may be on 127ns now and that would cause a issue with both sticks at once

    Ganged for single channel, and unganged for dual channel

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    I hope it's easier. I increased the RAM voltage +0.3v to 2.1v--the max allowed by this OCZ memory (and the mobo).

    I don't see anywhere that I can set ganged or unganged. (I thought I saw a different post by you, I'm almost positive, that ganged was for dual-channel. Am I mistaken?)

    I set the Trfc0-3 to 195ns. (Yes, it was on 127.) A single stick in slot 2 still didn't work. So I moved the stick from slot 2 to 1 and rebooted. The timings had returned to Auto. Is it normal for them to return to Auto after a failed boot?

    Anyway, I set them all to 195ns again and tried slots 1&2--no boot.
    I removed the stick from slot 2, set them all to 327.5ns, and tried slots 1&2--no boot.

    Since a single stick didn't work in slot 2 at 2.1v, does that confirm a bad mobo? Should I RMA it to NewEgg or directly to Gigabyte? (Will Gigabyte pay return shipping? NewEgg won't.)

    Happy Thanksgiving!

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    Yes, sorry! I dont know or help with AMD Much, it is Ganged for Dual channel. Since you Are you using the latest BIO, did you load optimized and save/apply/reboot after your flash? If so, try the hotkey, on the MAIN page of the BIOS press Control + F1 and then go into MIT and see if you can find it.

    It is normal for things to go back to auto if settings are wrong for sure.

    The ram may be bad, can you test it in another system with memtest86+ to be sure >>
    Memtest86+ - Advanced Memory Diagnostic Tool

    I would suspect the ram before the board

    Keep a eye on this thread or PM the user as he had a terrible time as well but finally got going >>>
    http://forums.tweaktown.com/f69/nigh...h-build-28521/

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    I'm afraid I don't have another system to try the memory in. I did buy a set of Corsair TWINX 2x2GB sticks and tried them in this board though, and they don't work either. Plus, a single stick works in slot 1 or 3, but not in slot 2 or 4, and you said it should work in all slots.

    I looked on the advanced DRAM page (CTRL+F1). (That's where I set the Trfc settings.) There's nothing there about ganged/unganged.

    Yes, I loaded optimized settings, and the dual-channel doesn't work with them either.

    That other user has my same board and CPU and the Corsair memory. I read that thread before I posted here. He was able to boot immediately. It sounds like his problem is more SATA-related. I've subscribed to that thread though; I'll be interested in how he got it fixed.

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    Ya, sorry to say but to me it does sound like you have faulty slot 3 and 4 then. Maybe you should RMA now while you can where you bought the board and save yourself the hassle

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    Default Re: GA-MA78GM-S2H (rev 1.1) doesn't allow dual-channel

    It seems unanimous (Gigabyte, OCZ, and myself) that the board's bad. Bummer. I'll start the RMA process and post back when I've tried the replacement. Thanks for all your help.

    Should I RMA it to NewEgg (who charges me for return shipping) or would Gigabyte cover return shipping if I RMA it to them?
    Last edited by skst; 11-28-2008 at 02:29 PM.

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