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Thread: GA-770TA-UD3 and Crucial 2G x2 RAM will not run at rated 1333

  1. #1
    Join Date
    Jul 2010
    Massachusetts, US

    Unhappy GA-770TA-UD3 and Crucial 2G x2 RAM will not run at rated 1333


    I have a three-week old Gigabyte GA770TA with a Phenom II 925 (x4) and 4 gigs worth of Crucial memory (2 x 2G, CT25664BA1339) running Windows 7 Ultimate x64. Video card is an eVGA model of the GT240 chipset (don't recall the exact model.) PS is a Thermaltake W0379 (500W). The motherboard BIOS is F3, the latest. It's not overclocked.

    Symptoms are familar: Random lockups and reboots. I'm using the stock AMD cooler and I reapplied silver grease (generic item branded by Rosewill), and my temps look fine, 40C at idle and maximum 62C under Prime95's CPU-only test. I repro'd the problem--very quickly--with Prime95's blended test.

    With both sticks in, system POSTS and boots normally.

    With only one stick in--either of them--the system will post but Windows 7 hangs on the logo screen (I suspect it hangs just after it loads all the drivers and starts the kernel where the black screen with mouse pointer would normally show up.)

    I reduced the speed to 1066 and the system has been unconditionally stable for almost a week. I did run Prime95 again under the CPU and blended tests and no problems seen then.

    This is what SIW says about memory: Slot 2 repeats Slot 1 since they're identical sticks, so I omitted that.

    Maximum Capacity 16384 MBytes
    Maximum Memory Module Size 1024 MBytes
    Memory Slots 4
    Error Correction None
    DRAM Frequency 535.7 MHz [my setting to 1066]
    Memory Timings 7-7-7-20 (CL-RCD-RP-RAS)

    Device Locator Slot 1
    Property Value
    Manufacturer Crucial Technology
    Part Number CT25664BA1339.M8SF
    Capacity 2048 MBytes
    Memory Type DDR3 (PC3-10700)
    Speed 667 MHz (DDR3 1333)
    Supported Frequencies 381.0 MHz, 457.1 MHz, 533.3 MHz, 609.5 MHz, 685.7 MHz, 761.9 MHz
    Memory Timings 5-5-5-14-19 at 381.0 MHz, at 1.5 volts (CL-RCD-RP-RAS-RC)
    Memory Timings 6-6-6-17-23 at 457.1 MHz, at 1.5 volts (CL-RCD-RP-RAS-RC)
    Memory Timings 7-7-7-20-27 at 533.3 MHz, at 1.5 volts (CL-RCD-RP-RAS-RC)
    Memory Timings 8-8-8-22-30 at 609.5 MHz, at 1.5 volts (CL-RCD-RP-RAS-RC)
    Memory Timings 9-9-9-25-34 at 685.7 MHz, at 1.5 volts (CL-RCD-RP-RAS-RC)
    Memory Timings 10-10-10-28-38 at 761.9 MHz, at 1.5 volts (CL-RCD-RP-RAS-RC)
    Manufacturing Date 2010, Week 18
    EPP SPD Support No
    XMP SPD Support No

    And voltages:

    Sensor Value Min Max
    CPU VCORE 1.09 V 0.99 V 1.30 V
    VIN1 1.52 V 1.52 V 1.52 V
    +3.3V 3.31 V 3.31 V 3.33 V
    +5V 5.00 V 5.00 V 5.03 V
    +12V 12.16 V 12.10 V 12.22 V
    -12V -5.12 V -8.06 V -4.10 V
    -5V -13.25 V -13.31 V -13.25 V
    +5V VCCH 3.60 V 3.58 V 3.60 V
    VBAT 3.22 V 3.22 V 3.22 V

    Gigabyte DES Top
    Sensor Value Min Max
    CPU 1.09 V 0.99 V 1.30 V

    I am thinking it's a configuration problem. Unless I'm very unlucky and both sticks are bad, I can't see how I would get a boot failure on both sticks one at a time; I expected one would be bad and it would post and boot on one but not the other. But it posts and boots on both sticks at once! And does not complete Windows boot on only one stick (I expect Win7 to run on 2G. Not as fast but it should at least boot.)

    I have tried both sets of DIMM slots; I am running the RAM in the "wrong" set of slots at the moment (the ones away from the CPU) and it's been fine that way for the whole week (I'll replace them in the "right" slots when its convenient.)

    It just has to be memory configuration. Only mention of this I found on the Crucial forums is from one who had the same problem with an Intel board ("this never happens to AMD users" Beg to differ. )

    I can't quite make the case for an RMA on any of the components unless there's a problem I don't know about (and I wouldnt've posted if it were.)

    Should I be looking at timing settings or voltage settings? Part of me doesn't want to bother troubleshooting the RAM at 1333 since it runs fine and there is no speed difference that I notice. The other half of me notes that 1333 is a default setting and that means if I reset the BIOS the board will be unstable again. I'd feel better if I could resolve this long-term (next RAM update in a few years.)
    Last edited by dmoisan; 08-01-2010 at 03:21 AM. Reason: Forgot PS in original post

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