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Thread: GA-EX58-UD5 won't boot with 3 DIMMs




  1. #1
    Join Date
    Jun 2009
    Posts
    5

    Default GA-EX58-UD5 won't boot with 3 DIMMs

    I have a brand new EX58-UD5 and i7-920 I'm building a new system with.

    Whenever I install 3 memory modules to enable 3 channel mode (slots 3_1, 3_3, and 3_5 populated) the system fails to boot and the diagnostic LED shows code "b2". If I install memory in only slots 3_1 and 3_5 the system boots.

    It does not matter which of the three memory modules goes in slot 3_5 - with memory there the system will not boot. With any 2 of the 3 modules in 3_1 and 3_5 the system boots. I don't think that the RAM is faulty.

    I have tried BIOS revisions F5, F7, and F8b. I have tried clearing the CMOS and using both fail-safe and optimal settings.

    The memory is a Corsair XMS3 6GB (3x2GB) kit, TR3X6G1333C9.

    Am I missing something or do I have a faulty board?

    Ben.

  2. #2

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    What is the DRAM voltage and SPD multiplier actually being set to when you boot with 2 sticks?
    i7 920 C0/C1 3841A
    24/7 OC: 21x183Mhz = 3.84Ghz @ stock Vcore/QPI voltages
    Thermalright Ultra-120 Extreme 1366
    3x2GB OCZ DDR1600 OCZ3P1600LV6GK
    EX58-UD4P BIOS F11
    EVGA GTX 260 Core 216 SC 55nm 896-P3-1257-AR
    Antec NEO HE 550 Power Supply

  3. #3
    Join Date
    Jun 2009
    Posts
    5

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    The DRAM voltage is 1.5V. With the multiplier set to 'Auto' the memory comes up at 1066MHz.

    I've tried setting it to 10x to get the speed to 1333MHz. I also set the timing to 9-9-9-24, per the Corsair specs. With these settings the system still boots fine with 2 modules, but won't boot with 3.

    Ben.

  4. #4

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    Your kit is rated at 1.5v at 1333Mhz so it should be okay but I would try leaving everything on AUTO but slightly raising DRAM and/or QPI voltage. Try QPI first by going from the default of 1.175v to around 1.2-1.22v. Then if that doesn't work alone, maybe up the ram voltage to 1.52-1.56v. There is always a bit of an offset so 1.52v in the BIOS may translate to actual 1.5v.

    Tell us what you find.
    i7 920 C0/C1 3841A
    24/7 OC: 21x183Mhz = 3.84Ghz @ stock Vcore/QPI voltages
    Thermalright Ultra-120 Extreme 1366
    3x2GB OCZ DDR1600 OCZ3P1600LV6GK
    EX58-UD4P BIOS F11
    EVGA GTX 260 Core 216 SC 55nm 896-P3-1257-AR
    Antec NEO HE 550 Power Supply

  5. #5
    Join Date
    Jun 2009
    Posts
    5

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    Hi demonsavatar ,

    I gave that a go and it didn't seem to make any difference - still can't boot with 3 DIMMS.

    Any other advice, or am I looking at returning either the mobo or CPU, or both?

    Ben.

  6. #6

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    Hey

    I had a similar problem when I first build my system. I have a UD4P with the same memory as you from Corsair, and no matter what I tried my PC would crash eventually when running in triple channel. It could be 1 hour or one day but it always crashed and telling me bad memory management when BSOD.

    I then tested each stick to see if 1 stick only was able to boot my PC and it turned out that one of the sticks was not able to.

    Not saying your problem is the same, but try with only one stick and see if they all are able to boot by them self.

    Poul

    P.S

    Had a hard time telling from your post if you all ready tried that.
    Last edited by Grnkjr0; 06-17-2009 at 10:46 PM.

  7. #7
    Join Date
    Jun 2009
    Posts
    5

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    Hi Grnkjr0,

    *Slaps forehead*

    I can't believe I didn't think of that - you were exactly right. The system boots fine with either one of the two working DIMMS installed, but with just the third it won't boot and I get the "b2" error.

    Looks like I have a faulty DIMM to return.

    Many, many thanks!

    Ben.

  8. #8
    Join Date
    Jun 2009
    Posts
    5

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    Just to close the loop on this - I had the faulty DIMM replaced and the system is now 100% fine.

    Ben.

  9. #9

    Default Re: GA-EX58-UD5 won't boot with 3 DIMMs

    Very nice to hear.

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