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Thread: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually




  1. #1
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    Default GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    I have a GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX which I wish to run with 8 gig of G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM and an
    Intel Core 2 Quad Q6600 Kentsfield 2.4GHz

    INitially I just used the "optimized defaults" settings.

    Although initially the board booted normally, and I was able to install the OS, over the next few days it became unstable. First thought was memory, and I removed/switched banks and it ran for a few hours. (Down to 2gig x 2 = 4gig) Did a windows memory test on the installed bank and it passed 5 iterations. Problem recurred - at this point when cold it will boot once, and if rebooted will continually go thru the post tests, come to the bios banner/menu screen, and restart without actually trying to boot. At the Gigabyte banner/menu it ignores input and resets after the memory test.

    I have a Soyo PCI test card, which indicates at least voltages on PCI bus are present, and has a hex post output display. I guess this is an award bios, some doc in the Soyo flyer - hard to read all the post output because it goes so fast, but I can see it does the initial cmos copy stuff c1-c3, etc, spends some time on the memory test 52, and then seems to stop at 88 before resetting. When it actually tries to boot shows FF.

    Without even trying to increase performance, what can I do to get stable operation?

    Thanks - greg martin.

  2. #2
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    So you tried each memory stick individually and they both passed? This is important.

    If the card is anything like the little displays on some motherboards then this means that it POSTed succesfully and the problem is instabilty, most likely caused by bad RAM or the PSU (most likely). If you didn't try the RAM seperately do taht and if you did then try changing the PSU.

    Can you be more clear on the cold boot issue? When can you get to actually boot into the windows memory test and when not?


  3. #3
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    No, I tested one pair, the one currently installed. I understand that on this board memory must be installed in pairs.

    When the system is cold - that is, has been powered down for some time, it will come up to the banner/menu, and follow one selection - ie del to enter bios config, f12 to select boot device, and honor that selection.

    If bios is selected, after setting bios it restarts, it goes to the banner, ignores input, and goes into a restart loop.

    If instead of selecting bios f12 select boot device is selected, it will boot from that device and continue to function. When shut down/rebooted, it will go to banner, ignore input, and go into a reset loop.

    Just did a memtest86+ pass and it completed it without errors. I note that the memory frequency and timing reported by memtest86+ were 533mhz, 5-7-7-20.

    As I recall, the last bios settings were 1066mhz, 5-5-5-15. I had set memory voltage at 2.0. (Label on the chip sez 5-5-5-15, 2.0-2.1v)

    Currently system is "coolinig off." Next I'll check the bios settings again - any reason memcheck+ should report different values? Then try starting with just one bank of memory and testing it.

  4. #4
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    Memory should be installed in pairs for optimal performance, but you can also just use one RAM stick. By doing so you can check whether one stick is defective which can cause the whole system not to fail to work properly.
    How long did you run memtest? One pass is not enough, even after a few hours of running there can still be errors.

    I think your problem is the PSU though. What's the manufacturer of your PSU?

    Also check all the power cables inside your case. One guy had a similar problem here where his system became usntable even though he did not change anything and the problem went away after he reconnected all the PSU cables.


  5. #5
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    1. removed and reseated PSU cables to mother board - no effect on reset loop.
    2. recalled the restart loop began after installing an additional drive (more power load)
    and tried removing power from the drive. no effect on reset loop.
    3. my psu is an ACE 580UB. A google returned at least one positive review.
    4. ran the windows test 4 passes on one pair w/no errors. ran memtest86+ 1 pass
    on same pair with no errors. ran memtest86+ 4 passes on the other pair w/no errors.

    I've yet to test sticks individually, but will do so. Still, I would think thatseveral hours of testing on each pair with no errors would argue against memory failure as a cause of a continual reset loop - an error on every pass? Maybe an occasional reboot or system hang but not a loop. Note both these error free tests were with system default memory voltages of 1.86v versus Gskill recommended 2.0-2.1.

  6. #6
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    Hmm. What do I know?

    Progress.

    I increased the chip voltage to 2.0v, and slowed the timings down to what memtest86+ was reporting: 5-7-7-20.

    Now there is no reset loop; it starts up and consistently goes to bios banner/menu, and recognizes input.

    It has hung once when running OS (ignores mouse & keyboard input) so I may have further issues. Probably I have other settings to adjust, and maybe I shoul decrease the timing values to the point where the problem recurrs.

    But at least I have a system that's beginning to work!

  7. #7
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    Good info. I missed the part about you using only 2.0V in your previous posts though, because this now sounds like a RAM issue. 2.0-2.1V means that the RAm may actually need 2.1V to run properly (but may run with 2.0V on siome boards or if you kot a good RAM kit). The fact that looser timings work better also points towards the voltage being the problem.
    If it works with 4GB and you put in 8GB then increase the voltage of the memory controller to 1.2V-1.3V. 8GB at 1066 is quite a strain for the controller so it usually needs more voltage.


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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    okay - what parameter is memory ontroller voltage? MCH Core? Current value (from default optimized settings) is 1.26v.

    Note - increased DRAM voltage to 2.08; timings to 5-5-5-15 and system does not have the reset loop problem.

    Whether everthing is stable I guess I'll know over time.

  9. #9
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    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    MCH is your NB, with 4 or 8GB you are going to need to raise that as well. Dram Voltage is your ram voltage. MCH May need 1.24-1.26 for 4GB and maybe 1.26-1.3 or more for 8GB, it all depends on all other settings though.

    Can you please link me to your ram or give me the model # and then I can best offer advice for 8GB setup.

    So you have 8GB going now or not yet?

  10. #10
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    Default Re: GIGABYTE GA-EP45-UD3R LGA 775 Intel P45 ATX resets continually

    Here is the url for Newegg's Gskill memory that I have"
    Newegg.com - G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory - Desktop Memory

    System currently is running with 8gig of memory.
    Currently I raised the Dram voltage to 2.08v.
    Timing 5-5-5-15.
    All other settings as "optimized defaults"

    Nickel020 suggested raising the memory controler voltage, but I do not see
    this parameter: the closest acronym I could find was Mch, which you say
    refers to the NB(North Bridge?).

    System is currently booting properly - no reset loop.

    This is to be a multi os system, with OSX, Vista, Redhat, and FreeBSD, primarily used as a DAW under OSX.

    Occasionally it "locks up" or has a kernel panic under OSX.

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