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Thread: Need help stabilizing memory on EP45-UD3P with E8400




  1. #1
    Join Date
    Oct 2011
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    Default Need help stabilizing memory on EP45-UD3P with E8400

    Assistance with this problem would be very much appreciated. I can run Prime95 blend test for 6 hours with the ram at 1066 (3.2B @3ghz). When I overclock to 3.6ghz and set the multiplier to 2.66D, blend test usually fails around test 9 or 13. If I raise MCH Core to 1.2 it usually fails sooner around test 5 or 7.

    The best Ive done through trial and error so far is 39 minutes of blend before it fails. I couldnt make anymore progress so I reset all the timings to default. I can run the small FFT test for 6+ hours without fail.

    Need help stabilizing memory on EP45-UD3P with E8400-settings-jpg

    Model:EP45-UD3P Rev#:1.1 Bios Version:F10
    Cpu: E8400
    Ram: Corsair, Dominator/CM2X2048-8500C5D, Amazon.com: Corsair TWIN2X4096-8500C5D Dominator 4GB 2 X 2GB PC2-8500 1066MHz 240-Pin DDR2 CL5 Dual Channel Desktop Memory: Electronics
    Power Supply Unit: Brand, Model#, Wattage

    note: replace all ?? with the value displayed in your bios.
    ----> Replace "Auto" with manually set values.

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster -------- : [Auto] <-- FAST is OK
    CPU Clock Ratio ---------------- : [9.0]
    Fine CPU Clock Ratio ----------- : [0.0]
    CPU Frequency -------------- : 3600

    Clock Chip Control
    Standard Clock Control CPU Host Clock Control --------- : [Enabled]
    CPU Host Frequency (Mhz) ------- : 400[Mhz]
    PCI Express Frequency (Mhz) ---- : [100]

    C.I.A.2 ------------------------ : [Disabled]

    Advanced Clock Control ------- [Press Enter]
    CPU Clock Drive ---------------- : 800mhz <-- show the values displayed in your bios for these four settings
    PCI Express Clock Drive -------- : 900mhz
    CPU Clock Skew (ps) ------------ : 0ps
    MCH Clock Skew (ps) ------------ : 0ps

    DRAM Performance Control Performance Enhance ------------ : [Standard]
    Extreme Memory Profile - (XMP) - : [Profile2]
    (G)MCH Frequency Latch --------- : [Auto]
    System Memory Multiplier ------- : [2.66D]
    Memory Frequency (Mhz) --------- : [1066]
    DRAM Timing Selectable --------- : [Auto] <-- set to MANUAL for overclocking

    Standard Timing Control
    CAS Latency Time ------- 5 ---- : [Auto] Note: If I disable XMP these values change to 5-7-7-24
    tRCD ------------------ 5 ---- : [Auto]
    tRP -------------------- 5 ---- : [Auto]
    tRAS ------------------ 15 ---- : [Auto]

    Advanced Timing Control
    tRRD ------------------ 4 ---- : [Auto]
    tWTR ------------------ 4 ---- : [Auto]
    tWR -------------------- 8 ---- : [Auto]
    tRFC ------------------ 68 ---- : [Auto]
    tRTP ------------------ 4 ---- : [Auto]
    Command Rate (CMD) ------------- : [Auto] <-- Auto or 0 is OK

    Channel A Timing Settings -- {Press Enter to change settings)
    Static tRead Value ------------- : [Auto]
    tRD Phase0 Adjustment ---------- : [Auto] <-- leave this and below set to AUTO
    tRD Phase1 Adjustment ---------- : [Auto]
    tRD Phase2 Adjustment ---------- : [Auto]
    tRD Phase3 Adjustment ---------- : [Auto]
    Trd2rd(Different Rank) --------- : [Auto]
    Twr2wr(Different Rank) --------- : [Auto]
    Twr2rd(Different Rank) --------- : [Auto]
    Trd2wr(Same/Diff Rank) --------- : [Auto]
    Dimm1 Clock Skew Control ------- : [Auto] ps
    Dimm2 Clock Skew Control ------- : [Auto] ps

    Channel B Timing Settings {Press Enter to change settings)
    Static tRead Value ------------- : [Auto]
    tRD Phase0 Adjustment ---------- : [Auto] <-- leave this and below set to AUTO
    tRD Phase1 Adjustment ---------- : [Auto]
    tRD Phase2 Adjustment ---------- : [Auto]
    tRD Phase3 Adjustment ---------- : [Auto]
    Trd2rd(Different Rank) --------- : [Auto]
    Twr2wr(Different Rank) --------- : [Auto]
    Twr2rd(Different Rank) --------- : [Auto]
    Trd2wr(Same/Diff Rank) --------- : [Auto]
    Dimm1 Clock Skew Control ------- : [Auto] ps
    Dimm2 Clock Skew Control ------- : [Auto] ps

    Channel A and B Driving Settings ------ {Press Enter to change settings)
    Driving Strenght Profile ------- : [Auto] <-- setting for channel A
    Driving Strenght Profile ------- : [Auto] <-- setting for channel B

    Motherboard Voltage Control
    CPU
    Voltage Types--------- Normal ----- Current -----
    Load-Line Calibration ---------- : [Disabled]
    CPU Vcore ----------- 1.1625 -- : [1.1625]

    CPU Termination ----- 1.200V* -- : [1.200] <-- set to the value to the left (Auto over-volts this too much when overclocking) Auto is OK if not overclocking
    CPU PLL ------------- 1.500V* -- : [1.500] <-- set to the value to the left (Auto over-volts this too much when overclocking) Auto is OK if not overclocking

    CPU Reference ------- 0.7600V* -- : [Auto] <-- Auto Will set this correctly

    MCH/ICH MCH Core ------------- 1.100V -- : [1.100] <-- set to 1.20 for 2x2GB ram (1.24 - 1.26, or 1.05 might be needed)
    MCH Reference -------- 0.760V -- : [Auto]
    MCH/DRAM Ref --------- 0.900V -- : [Auto]
    ICH I/O -------------- 1.500V -- : [Auto] <-- set to the value to the left
    ICH Core ------------- 1.100V -- : [Auto] <-- set to the value to the left
    DRAM DRAM Voltage --------- 1.800V -- : [2.100] <-- set to the max rated ram voltage (for most memory)
    DRAM Termination ----- 0.900V -- : [Auto]
    Channel A Reference -- 0.900V -- : [Auto]
    Channel B Reference -- 0.900V -- : [Auto]

    Advanced Settings
    Limit CPUID Max. to 3 ---------- : [Disabled]
    No-Execute Memory Protect ------ : [Enabled]
    CPU Enhanced Halt (C1E) -------- : [Disabled]
    C2/C2E State Support ----------- : [Disabled]
    x C4/C4E State Support --------- : [Disabled]
    CPU Thermal Monitor 2 (TM2) ---- : [Enabled]
    CPU EIST Function ------------- : [Disabled]
    Virtualization Technology ------ : [Disabled] <-- Enabled if you use Vmware/Virtual PC Integrated Peripherals
    Legacy USB Storage Detect ----- : [Enabled] <-- set to Disabled when overclocking (this must be enabled to flash or boot from a USB drive)

  2. #2
    Chike is offline Senior Member
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    tRD(Static tRead Value in BIOS, Performance Level in MemSet) 12 is too high, set it to 7(both channels) and see if you can pass memtest86+ first. If you are unable to boot with tRD 7 try 8.
    Leave VTT(CPU Termination) 1.2v, and try MCH Reference 1-3 clicks below default(0.76), if it isn't making any better try 1-3 clicks above default.

    What CPU cooler do you have and what are core temperatures under Prime95 load?

  3. #3
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    Running memtest now with tRead set to 7

    I have the corsair H60 cooler. Temps are 48-50 under load in Prime95

  4. #4
    Chike is offline Senior Member
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    If memtest86+ doesn't fail lower MCH Reference before starting windows.
    tRD 7 add performance but may be even more unstable so no point testing it with Prime95 with the same settings as before.

  5. #5
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    Well you appear to be a genius. Memtest passed. Lowered the MCH reference to 0.74. P95 blend test has been running for nearly 2 hours now with no errors. Appreciate the help Chike.

  6. #6
    Chike is offline Senior Member
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    You're welcome.
    It may need another tick down, you will see based on tests.
    There are 2 other threads OCing the E8400 you may have a look at them.
    ED45-UD3p with 8400 Dual Core overclock help! :)
    Ga Ep45 UD3P rev 1.0 Bios assistance

  7. #7
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    Tried 6 and it wouldnt post. My performance seems pretty good at 7 though. 62ns and 8.5 gb/s in maxxmem. Ive actually been reading those other 2 threads over the past couple days. I may try to go for a higher overclock in a month or so when I have more time and it's a bit cooler outside.

  8. #8
    Chike is offline Senior Member
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    You can try and set vcore Normal instead a value, and enable C1E and EIST power saving features.
    If it becomes unstable, try enabling LLC(Load Line Calibration)
    .Memory performance are +- what you can get at 400MHz FSB.

  9. #9
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    Set vcore to normal and enabled C1 and EIST. Idle temps are now around room temperature at 27c - 28c

  10. #10
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    Default Re: Need help stabilizing memory on EP45-UD3P with E8400

    So when Vcore is set to "normal", it lowers the voltage based on CPU usage. How can I raise the vcore and still have it lower the voltage when cpu usage is low? Thanks.

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