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Thread: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?




  1. #41
    Lsdmeasap's Avatar
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    Well, it's very odd but now I think mine are fine??!

    I was using an old BIOS (F7x) previously and am now on F8c, and I'm testing on X58A not P55, so maybe that was the issues with my set?

    133 Bclk fine (Auto all except Uncore/Mem multi/Mem timings), and testing 160 Bclk now (All manual) and it's look fine as well!

    So that leaves me thinking you guys both need to try the very latest BIOS again just to be sure because it seems like all the issues I had previously must have been the older BIOS.

    I wont know how a cold boot is until morning, but I think it will be fine now after seeing how much stability I have now in windows.

    Before with F7x I had ZERO stability in windows, no matter the settings, and cold boots were terrible no matter the settings (Dropped memory channels, instant reboots/BSOD's on windows load up to 10x in a row within seconds, ect)

    Now with F8c I have full stability in windows, auto or manual settings. Cold boot testing will be done later but I think this is sorted now for X58A, at least with my set of similarly based sticks (Mushkin Copperhead 998771 - 7-8-7-20)
    Last edited by Lsdmeasap; 11-16-2010 at 02:28 PM.

  2. #42
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    Just slammed them in the UD6 after a CMOS flash and a few random settings, i am into memtest. As of right now settings are at 1367mhz 9-9-9-24 (AUTO settings FTW?)

    I will get back with you to let you know how this pans out, but as of now I am up for the night testing with these again. I really hope something comes of this.

    That failed...after a new CMOS flash I set the XMP. With the i5 750 is went to 160bclk. I'll likely edit this before you even get to read it. ;)

    Failed as well in test #7, so now trying 1.35V QPI/VTT, 1.66V to the memory, and XMP. The CPU is under stock for this testing but i keep 1.25V going through her manually. Failed test #5...lol

    Now I'm doing one stick at a time on the above settings. See if I can sort this out to a single stick issue.
    Last edited by chad_sebring; 11-16-2010 at 02:08 PM.

  3. #43
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    Haha, ya Auto is funny like that sometimes!

    I've even seen it set 1.5 QPI/Vtt with low speed and loose timings like that :)

    Test the XMP if you have XMP, then also test a few manual runs at various speeds as well. Ahh yes, I see you do have XMP, it'll have to be 160 Bclk to run 1600Mhz with that CPU.

    They suggested to test the following settings and see how they work, a few not ideal but you know how that goes when testing for issues :)

    CL:7
    tRCD:8
    tRD:7
    tRAS:24

    tRC:40
    tRRD:5
    tWTR:6
    tWR:12
    tWTP:23
    tWL:7
    tRFC:136
    tRTP:6
    tFAW:50
    CMD:2

    B2B: auto
    RTL auto

    My own personal note to that is, be sure RTL's are not being automatically set too tight. I've seen them jump around sometimes, without any other settings being changed, so just something to keep an eye on for anything odd looking.
    Last edited by Lsdmeasap; 11-16-2010 at 02:17 PM.

  4. #44
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    Good set of numbers to go by. As soon as I test both sticks in this XMP setup with 1.35VTT I will go on to those timings and see if I get any love. Now go get some sleep already!

    Some success, I got one pass with one stick. The timings were tighter than what you had listed, so I went back and set those. Just doing a retest to be sure with a few more passes this time, then off to the other stick. Hopefully it isn't a bad module, as both failed in the UD7 I am really unsure exactly what is going on now...lol.
    Last edited by chad_sebring; 11-16-2010 at 02:24 PM.

  5. #45
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    I'll do some of my own testing on P55A later this week too just to see if I run into similar issues as you guys are seeing.

  6. #46
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    OK, pass and fail again for my testing!


    Pass with windows warm boot and stability during last nights testing. Passed 10x LinX with 4GB memory, 6x Memtest HCI using 680MB each passed 500%.

    Even with a few tweaked timings, all looked good.

    4.2Ghz / 1680Mhz ram (7-8-7-20)





    Then FAIL...

    This morning cold boot issues reared it's ugly head again, this time corrupting several of my programs such as Firefox and windows live mail!

    4Ghz / 1600Mhz ram (7-8-7-20)




    This was all auto, except uncore set by me at 3.52Ghz, and QPI/Vtt and ram voltage set manually - all of which should be 100% stable.

    Cold boot issues were instant reboots at the desktop, 5+ times w/ 0x00000050 BSOD (Uncore only at 3.6Ghz), others include desktop load ok but startup programs instantly crash one after another (Prefetch, DWM manager, ect) until BSOD again 3-4 times causing chkdsk to run.

    I finally gave up again, as before, these are not usable on current BIOSes and I had to remove them sticks and recover my programs via system restore.

    I have PSC rated with timings at 8-10-8 @ 2000Mhz and 6-8-6 @ 1600Mhz and they work just fine, even at much tighter timings and even at 7-8-7 timings as well. It seems to me that only the PSC rated at 7-8-7 are the issue, and these are the newer type as the ones with tRCD at +2 have been used for a longer time I think.
    Last edited by Lsdmeasap; 11-17-2010 at 01:11 AM.

  7. #47
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    ok finally got a nap in.

    I was tinkering all night and came up fail as well. I can run each stick for a couple passes individually, but no matter what I do I cant get one pass to complete with both of them in there. I guess I will give Corsair another shout and see what they have for me.
    Last edited by chad_sebring; 11-17-2010 at 05:44 AM.

  8. #48
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    Really apreciate you taking the time to look at this LSD. Much more than the actual Gigabyte Tech support have

    I'm basically in the same situation as you in post 46. Optimized defaults at 133 and XMP with Optimized defaults are both perfectly stable after setting them, as is 4GHz (191*21) and DDR-1528. I only get instability from a cold boot. On cold booting, if I surf the net, I get tabs re-starting constantly, Flash Player crashes, Shockwave errors etc and LinX fails before the first run is complete.

    Checking with CPU Tweaker, RTL is always at 54/56 (A/B). That seems pretty reasonable. Tried loosening them in testing ages ago to 57/59, 62/64 but no joy.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
    P55A-UD4 v2.0 @ F14
    Core i5 760 @ 20 x 201, 4.02GHz
    TRUE Black with a single Noctua NF-P12 pumping out 55 CFM @ 19db .
    2 x 2GB Mushkin Ridgeback (996902), @ 7-10-8-27, 2010-DDR, 1.66v
    2 x Gigabyte GTX 460 1024MB in SLI (Pre OC'd to 715MHz core and 1800MHz VRAM) @ 850 Core / 4100 Mem.
    Intel X25-M Boot Drive (OS and Programs) 200MB/s Read & 90MB/s Write
    Corsair X32 200MB/s Read & 100MB/s Write
    WD Caviar Blue 640GB C (Steam, Games, Storage, Temp Files & Folders, etc)
    Samsung F3 500GB Backup/Images
    Noctua 1300RPM 19dB case fan (rear extraction)
    3 x 140 MM Coolermaster LED fans (one front intake, one top extraction, one side intake)
    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  9. #49
    Lsdmeasap's Avatar
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    No problem, you know me I'm always happy to help!!

    I think my set acts just about as you mentioned if I only run dual channel. But WOW, with 3 sticks and I can't even get windows to really load much past the desktop before it goes crazy crashing things left and right, or instant reboot without a BSOD even sometimes

    Unusable for sure, I've had my set in 2-3 different times for testing and each time when I come back to my PC after a while, forgetting they are installed, I immediately have to take them out before I loose my mind

    Gigabyte said they've requested a set from Corsair, so I'll update once I hear back from them on their testing.

  10. #50
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    Default Re: Incompatability: Corsair XMS3 CMX4GX3M2A1600C7 and P55A UD4?

    Some good news, well sort of. I did manage to get the sticks stable in memtest, well so far, still testing. On the urge of a friend I pulled my X38A Foxconn out of the basement. It set the ram to 1066mhz and i manually set them to 7-7-7-20. So at least for now I may be able to carry on with the project, but as for the Gigabyte with real timings I'm still at a loss.

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