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Thread: UD3P / E8500 C0 / 4x1GB D9GMH OC trouble




  1. #1
    Join Date
    Jun 2008
    Posts
    3

    Post UD3P / E8500 C0 / 4x1GB D9GMH OC trouble

    Hi there,

    I recently switched over from a Maximus Formula x38 @ Rampage x48 to the EP45-UD3P.

    Today's overclock-day so here's a little worklog. Any input is very welcome.


    The full system specs are in my signature, but we're dealing with an E8500 C0 here.
    The RAM was capable of something remotely stable on 1200-5-5-5-18 4x1GB. I'm aiming at <=DDR2-1200.

    I'm looking at getting the maximum out of my RAM while maintaining the highest stable CPU OC.

    I consider "stable" roughly 5 minutes of OCCT testing. After such stability I move on to the next step, until instability shows up, then I back off and start long-term testing.

    DRAM 1:1, 2v (should suffice up to DDR2-1050/1100 on loose timings)
    LLC: Disabled
    BIOS: F9

    4.0GHz stable: (no tweaking or finetuning voltages)
    9x445
    vCPU: 1.4v (1.34 Win)
    vTT: 1.3v
    ref: 0.848v
    PLL: 1.59v
    vMCH 1.2v
    ref: 0.783v
    DRAMref: 0.91
    ICH I/O: 1.59v
    ICH Core: 1.2v

    4.2GHz stable: (no tweaking or finetuning voltages)
    9.5x443
    vCPU: 1.475v
    (1.44v boot, 1.4v load Win)
    vTT: 1.3v
    ref: 0.848v
    PLL: 1.59v
    vMCH 1.2v
    ref: 0.783v
    DRAMref: 0.91
    ICH I/O: 1.59v
    ICH Core: 1.2v


    4.3GHz UNSTABLE:
    9.5x453
    vCPU: 1.525v (1.47v boot, 1.44v load Win)
    vTT: 1.3v
    ref: 0.848v
    PLL: 1.59v
    vMCH 1.2v and 1.3v
    ref: 0.783v
    DRAMref: 0.91
    ICH I/O: 1.59v
    ICH Core: 1.2v


    4.4GHz UNSTABLE:
    9.5x464
    vCPU: 1.55v
    (1.5v boot, 1.47v load Win)
    vTT: 1.3v
    ref: 0.848v
    PLL: 1.59v
    vMCH 1.3v
    ref: 0.783v
    DRAMref: 0.91
    ICH I/O: 1.59v
    ICH Core: 1.2v

    Note: vTT 1.3v OCCT 15 secs. vTT 1.4v OCCT 3 secs.
    Note2: Temperatures are always fine. Load on 4.4GHz is 65c


    Any input on the 4.2GHz+ settings is more than welcome.


    On to setting RAM settings:

    My Maximus needed the following voltages for the following frequencies to be remotely stable:


    Using the 4.2GHz template (9.5*443) with a lower multiplier.
    MCH/DRAM Ref: Auto
    DRAM Term: Auto
    Channel A/B: Auto
    DRAM Drive Strenght: 1066MHz
    BIOS: F4

    POST - Boot - OCCT (Unstable, 10sec))
    Strap: 2.66D
    Speed: DDR2-1181-5-5-5-18
    Volt: 2.24v (2.21v win)
    MCH: 1.3v
    PL/TRD: Auto

    POST - Boot - OCCT (Unstable, 1:30min)
    Strap: 2.66D
    Speed: DDR2-1181-5-5-5-18
    Volt: 2.28v (2.21v win)
    MCH: 1.3v
    PL/TRD: Auto

    POST - Boot - OCCT (Unstable, 15secs)
    Strap: 2.66D
    Speed: DDR2-1181-5-5-5-18
    Volt: 2.28v (2.21v win)
    MCH: 1.4v
    PL/TRD: Auto

    POST (Unstable)
    Strap: 2.66D
    Speed: DDR2-1181-5-5-5-18
    Volt: 2.30v
    MCH: 1.3v
    PL/TRD: Auto

    So, as it seems my UD3P doesn't like it when I up the voltage of my RAM, which I think is really odd. If anyone can give me info on this it'd be much appreciated!


    edit:
    signature doesn't show up for this post yet, so here it is:
    .ultraV
    AC Ryan Acrylic Black Case
    Zalman Z600-HP

    Gigabyte GA-EP45-UD3P F8
    Intel E8500 C0
    Team Xtreem PC2-6400(Micron D9GMH)
    GeForce 6600GT 128MB
    2x Western Digital Caviar 250GB 16MB
    Lots of UV-purple case fans and cold cathodes
    Pink water cooling - silly!
    Last edited by Allubz; 07-13-2009 at 09:11 PM.

  2. #2
    Join Date
    Apr 2009
    Location
    J'Habite En Angleterre
    Posts
    2,431

    Default Re: UD3P / E8500 C0 / 4x1GB D9GMH OC trouble

    Does the CPU have a known good maximum frequency and Vcore requirement? If you've gotten over 4.2GHz with it before than RAM is likely to be the cause of instability.

    Tweaking Driving Strength, sub timings and Static tRead in particular is helpful. I have manaed to squeeze ~30 real MHz (DDR-60) extra out of a set of XMS2 PC2-6400C5 (Ver 4.1, Samsung I believe) above it's current overclock, which isn't the best clocking stuff ever, by tweaking driving strength.

    You may also find the 2.66 multi on the C strap may yield more stable results. For example I can't even boot with 2.66D at the settings in my sig, but 2.66C works just fine, as does 2.50A.

    As I'm sure you're aware, upping VDIMM will also increase MCH/DRAM, DRAM Ref and Channel a&B ref. Default scaling is 50% of VDIMM, but you may have luck with more or less. As with adjusting CPU and MCH ref, if you temporarily set 1.8V VDIMM, then set the relevant refs to 0.9, then alter them up or down, they will scale correctly when VDIMM is increased.
    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)
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    Dell Ultra Sharp 2209WAf E-IPS @ 1680x1050

  3. #3
    Join Date
    Jun 2008
    Posts
    3

    Default Re: UD3P / E8500 C0 / 4x1GB D9GMH OC trouble

    Thanks for responding.

    4.2GHz runs fine. I find it odd that I can't get 4.3-4.4GHz stable on sub 60c load temperatures.

    It is hard to set those references right if I don't know which way to go, as in, higher or lower. On Auto I suppose the DRAM references are at 50%. I can still fiddle with these settings, though.

    I'm using the Anandtech article on straps and timings, but it's hard to understand and it's not always too accurate, I found out using my Maximus.
    AnandTech: ASUS ROG Rampage Formula: Why we were wrong about the Intel X48

    An official reply on how these DDR voltages work would be nice. My Maximus allowed me to set 2.5v no problem, so I'm a bit annoyed that the UD3P doesn't "just" set 2.4 when I want it to, but maybe that's my fault ;)
    .ultraV
    AC Ryan Acrylic Black Case
    Zalman Z600-HP

    Gigabyte GA-EP45-UD3P F8
    Intel E8500 C0
    Team Xtreem PC2-6400(Micron D9GMH)
    GeForce 6600GT 128MB
    2x Western Digital Caviar 250GB 16MB
    Lots of UV-purple case fans and cold cathodes
    Pink water cooling - silly!

  4. #4

    Default Re: UD3P / E8500 C0 / 4x1GB D9GMH OC trouble

    Allubz, I have 4x1G Kingstons on UD3P and 1.2V is all I need to run 'um at 1200. I believe you may be experiencing multiple instability issues at 443x9.5 that is obscuring your memory oc results. May I suggest testing the memory at around 360x9.5 using the 3:5 divider (3.33D multi) first and then move on to FSB and CPU overclocks with appropriate PL adjustments.
    QX9650 batch L739A761/ GA-EP45-UD3P/ Kingston KHX9200 4x1G

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