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Thread: OC on a EP43-DS3 with intel E7400




  1. #1
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    Lightbulb OC on a EP43-DS3 with intel E7400

    Hey there folks,

    I've just built a cheep EP43 based system and looking to get some extra juice outta it via OC.

    have one stick of ram, Kingston valueram KVR800D2N5/2G
    timings of 5-5-5-18
    cpu is the E7400 Intel® Core™2 Duo Processor E7400 (3M Cache, 2.80 GHz, 1066 MHz FSB)

    tried a wee OC ..
    FSB 300 MHz , cpu 10.5x ... 3.15GHz
    cpu v = 1.35625v
    temp gets to about 65 deg C in prime95, 38 at rest

    tried on befoe with 1.35v and it resulted in a hardware fault in prime95 after two hours.

    since then i turned off the cpu EIST fuction and upped the voltage a notch... and no errors after 3 hours so far ..

    seems a bit crap really ... can i have some settings help to get my volts down and keep stablity?

    i'd rather not OC the ram if poss, but i'm not too sure about the MCH Frequency Latch settings and what they should be ... i can get ram at 800 via a 'D' and 'C' setting .. not sure which i should use .. i tried D 1st in my failed OC ... currently using C

    I loaded optimised defaults before trying any OC

    curent bios settings:

    Code:
    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster .................: auto
    CPU Clock Ratio .........................: 10x
    Fine CPU Clock Ratio.....................: 0.5
    CPU Frequency ...........................: 3.15Ghz
     
     
    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control...................: [Enabled]
    CPU Host Frequency (Mhz) ................: 300Mhz
    PCI Express Frequency (Mhz) .............: 100
    C.I.A.2 .................................: [Disabled]
     
     
    Advanced Clock Control [Press Enter]
    CPU Clock Drive..........................: 800 mV
    PCI Express Clock Drive..................: 900 mV
    CPU Clock Skew (ps)......................: 0 ps
    MCH Clock Skew (ps)......................: 0 ps
     
     
    DRAM Performance Control
    Performance Enhance......................: [STANDARD]
    (G)MCH Frequency Latch...................: [auto]
    System Memory Multiplier ................: 2.66C
    Memory Frequency (Mhz) ..................: 800Mhz
    DRAM Timing Selectable ..................: [Auto]
     
    Standard Timing Control
    CAS Latency Time.........................: 5
    tRCD ....................................: 5
    tRP'.....................................: 5
    tRAS.....................................: 18
     
    Advanced Timing Control
    tRRD.....................................: 3
    tWTR.....................................: 3
    tWR......................................: 6
    tRFC.....................................: 52
    tRTP.....................................: 3
    Command Rate (CMD) ......................: 0
     
    Driving Strength Profiles
    Driving Strength ........................: 
     
    Channel A
    Static tRead Value.......................: 5
     tRD Phase0 Adjustment...................: 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  
    Dimm2 Clock Skew Control.................: Auto  
    DDR write Training...........................:auto
     
    Channel B
    Static tRead Value.......................: 9
     tRD Phase0 Adjustment...................: 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  
    Dimm2 Clock Skew Control.................: Auto  
     
    Motherboard Voltage Control
    Voltage Type.............................: Manual
     
    CPU
    CPU Vcore................................: 1.35625V    (normal is  1.2625v)
    CPU Termination..........................: auto    (normal is  1.200v)
    CPU PLL..................................: auto       (normal is  1.500v)
    CPU Reference............................: Auto   (normal is  0.760v)
     
    MCH/ICH
    MCH Core.................................: Auto     (normal shows as 1.100V)
    MCH Reference............................: Auto   (normal shows as 0.760V)
    MCH/DRAM Ref.............................: Auto   (normal shows as 0.900V)
    ICH I/O..................................: auto    (normal shows as 1.500V)
     
     
    DRAM
    DRAM Voltage.............................: auto   normal shows as 1.8V
     
    DRAM Termination.........................: auto,  normal shows as 0.9V
    Channel A Reference......................: auto   ,normal shows as 0.9V
    Channel B Reference......................: auto   ,normal shows as 0.9V
     
    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]

    any help would be great, cheers. oh also does the cpu core voltage set in bios drop once windows boots? ... cause it gets down to 1.33 once in windows.

  2. #2
    Lsdmeasap's Avatar
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    Default Re: OC on a EP43-DS3 with intel E7400

    Yes, the CPU Voltage will drop once you get into windows, this is called vdrop. It will drop again at full load this is called vdroop.

    You should use the A or B memory Multi's but if you can get C to work then use it. It all really depends on the FSB you are using, under 333 FSB A should work best for you, especially so since that is the default Strap of your CPU

    Here would be optimal settings for your above settings Plus a Bump in FSB, voltage on the CPU may be able to be lowered once you set Vtt (Termination) but may also need a increase to reach 333 FSB

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster .................: auto or fast
    CPU Clock Ratio .........................: 10x
    Fine CPU Clock Ratio.....................: 0.5
    CPU Frequency ...........................: 3.15Ghz


    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control...................: [Enabled]
    CPU Host Frequency (Mhz) ................: 333Mhz
    PCI Express Frequency (Mhz) .............: 100
    C.I.A.2 .................................: [Disabled]


    Advanced Clock Control [Press Enter]
    CPU Clock Drive..........................: 800 mV
    PCI Express Clock Drive..................: 900 mV
    CPU Clock Skew (ps)......................: 0 ps
    MCH Clock Skew (ps)......................: 0 ps


    DRAM Performance Control
    Performance Enhance......................: [STANDARD]
    (G)MCH Frequency Latch...................: [auto]
    System Memory Multiplier ................: 2.40B or 2.50A
    Memory Frequency (Mhz) ..................: 800Mhz /832^
    DRAM Timing Selectable ..................: [Manual]

    Standard Timing Control
    CAS Latency Time.........................: 5
    tRCD ....................................: 5
    tRP'.....................................: 5
    tRAS.....................................: 18

    Advanced Timing Control
    tRRD.....................................: 3-4
    tWTR.....................................: 3-6
    tWR......................................: 4-6
    tRFC.....................................: 52-62
    tRTP.....................................: 3-5
    Command Rate (CMD) ......................: 2

    Driving Strength Profiles
    Driving Strength ........................: 800/1066 try both last

    Channel A
    Static tRead Value.......................: 6-9 (A & B Must match)
    tRD Phase0 Adjustment...................: 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
    Dimm2 Clock Skew Control.................: Auto
    DDR write Training...........................:auto

    Channel B
    Static tRead Value.......................: 6-9
    tRD Phase0 Adjustment...................: 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
    Dimm2 Clock Skew Control.................: Auto

    Motherboard Voltage Control
    Voltage Type.............................: Manual

    CPU
    CPU Vcore................................: 1.35625V (normal is 1.2625v)
    CPU Termination..........................: Set 1.2-1.325
    CPU PLL..................................: Set 1.5-1.6
    CPU Reference............................: Auto (normal is 0.760v)

    MCH/ICH
    MCH Core.................................: Auto (normal shows as 1.100V)
    MCH Reference............................: Auto (normal shows as 0.760V)
    MCH/DRAM Ref.............................: Auto (normal shows as 0.900V)
    ICH I/O..................................: auto (normal shows as 1.500V)


    DRAM
    DRAM Voltage.............................: 1.8-1.85/1.9

    DRAM Termination.........................: auto
    Channel A Reference......................: auto
    Channel B Reference......................: 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]

  3. #3
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    Default Re: OC on a EP43-DS3 with intel E7400

    awesome, thanks for that, i'll try tonight.

    i ran prime95 for like 6hours last night at 3.15GHz on the blend test, using the 2.66C strap ... no probs at all and a max temp of 58 .. windows showing 1.31v under load, so i think i shouldn't have many probs upping my FSB.


    still don't totally have my head around this MCH strap thing yet. is it like setting a seperate FSB speed to the MCH? .. and this is different to the one set for the CPU? i thought there was just one "FSB"? ... and i guess setting a strap with a higher FSb will overclock the MCH more than a lower one ... and thus be more unstable?

    because as i mentioned my 1st attepmt was with a D strap (400MHz) ..and that failed prime95 ... my OC last night where i prettymuch just changed to a C strap (200MHz) .. resulted in rock solid prime95 for 6+ hours till i stopped it. is this strap setting actually overclocking the MCH?

    and how do you mean that 333MHz is the default strap of my cpu .. the normal FSB setting with out OC is 266X10.5 i think

  4. #4
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    Default Re: OC on a EP43-DS3 with intel E7400

    ah sorry, read yr reply wrong, your sying at a 333FSb ..i should go with a A strap because it is the default strap used when my cpu isn't OC'd, ie 266.

    so is it better to go with the strapping with the FSB that closest matches what ive actually got the FSb set at ... or is it better, more stable, if i pick the strap with the lowest FSb poss that'll keep my ram speed in similar line with a strap that may be a closer match for my FSB.

    eg, say i wanted to keep my ram at 800MHz

    with my FSB set at 300 .. i had both the C and D options avail to me that would both result in a 800MHz ram speed, which is what i want ... so thats a 200 and a 400 strap option. i fould the C one more stable for my system .... my question is why would the 400MHz D strap be less stable.... what is that strap resulting in that would stress my system more? .. physically. is that higher FSb setting of 400MHz overclocking the northbridge too far for my motherboard at current voltages or something?
    Last edited by sun-drop; 02-26-2009 at 08:11 AM.

  5. #5
    Lsdmeasap's Avatar
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    Default Re: OC on a EP43-DS3 with intel E7400

    Quote Originally Posted by sun-drop View Post
    still don't totally have my head around this MCH strap thing yet. is it like setting a seperate FSB speed to the MCH? .. and this is different to the one set for the CPU? i thought there was just one "FSB"? ... and i guess setting a strap with a higher FSb will overclock the MCH more than a lower one ... and thus be more unstable?

    because as i mentioned my 1st attepmt was with a D strap (400MHz) ..and that failed prime95 ... my OC last night where i prettymuch just changed to a C strap (200MHz) .. resulted in rock solid prime95 for 6+ hours till i stopped it. is this strap setting actually overclocking the MCH?

    and how do you mean that 333MHz is the default strap of my cpu .. the normal FSB setting with out OC is 266X10.5 i think
    The MCH Strap is the Northbridge Speed and timings, kinda like FSB but not. More like memory timings and speeds

    Higher strap = Looser timings/more stable
    Lower strap = Tighter timings/less stable

    I said under 333 FSB that you should use A strap because IT was your CPU Default, A/266 not 333, sorry to confuse you


    Quote Originally Posted by sun-drop View Post
    ah sorry, read yr reply wrong, your sying at a 333FSb ..i should go with a A strap because it is the default strap used when my cpu isn't OC'd, ie 266.
    No at 333 FSB you should use the 333/B Strap, but you can use any strap on any FSB you want, some may just not work and other may take days to get stable. The rule is the lowest you can use the better, so try A always even at 333/B speed, but if A starts to fail then use B

    Quote Originally Posted by sun-drop View Post
    so is it better to go with the strapping with the FSB that closest matches what ive actually got the FSb set at ... or is it better, more stable, if i pick the strap with the lowest FSb poss that'll keep my ram speed in similar line with a strap that may be a closer match for my FSB.

    eg, say i wanted to keep my ram at 800MHz

    with my FSB set at 300 .. i had both the C and D options avail to me that would both result in a 800MHz ram speed, which is what i want ... so thats a 200 and a 400 strap option. i fould the C one more stable for my system .... my question is why would the 400MHz D strap be less stable.... what is that strap resulting in that would stress my system more? .. physically. is that higher FSb setting of 400MHz overclocking the northbridge too far for my motherboard at current voltages or something?
    I would use C in that case, for two reasons. One you already found it to be stable, and two it is the better (Tighter NB Timings) of the two.

    You likely found 400/D to be unstable or unbootable for you due to incorrect MCH Voltages or to low of a tRD (Static tRead Value). There are MANY things that affect what strap you can run, not just FSB

  6. #6
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    Default Re: OC on a EP43-DS3 with intel E7400

    ahh ok i think i'm starting to see the reasoning behind these settings now.

    so i tried the 2.40B strap, and yep rand for like 6 hours in prime at 3.5GHz before i had a hw failure

    but i haven't touched yr other suggested settings of in particular the MCH voltage.

    so the way i now understand it, if i had run with the 2.00B strap, i'd be running in syconious mode, double the FSB for DDR, 667Mhz

    2.40B at 800Mhz ..is a overclock of the memory systems? MCH?

    so hence the need for a bit more juice on the MCH core and ram?


    i'll try alll yr settings now and see how it goes.

    btw whats the reason for setting CMD at 2?

  7. #7
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    Default Re: OC on a EP43-DS3 with intel E7400

    ok, i'm going for 3.5Gz, but can't get past 20mins of so of prime95's small FFT, ...however ..i can go 3hours and more before i stop myself when running the large FFT, on these settings:

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster .................: auto or fast
    CPU Clock Ratio .........................: 10x
    Fine CPU Clock Ratio.....................: 0.5
    CPU Frequency ...........................: 3.5Ghz


    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control...................: [Enabled]
    CPU Host Frequency (Mhz) ................: 333Mhz
    PCI Express Frequency (Mhz) .............: 100
    C.I.A.2 .................................: [Disabled]


    Advanced Clock Control [Press Enter]
    CPU Clock Drive..........................: 800 mV
    PCI Express Clock Drive..................: 900 mV
    CPU Clock Skew (ps)......................: 0 ps
    MCH Clock Skew (ps)......................: 0 ps


    DRAM Performance Control
    Performance Enhance......................: [STANDARD]
    (G)MCH Frequency Latch...................: [auto]
    System Memory Multiplier ................: 2.40B
    Memory Frequency (Mhz) ..................: 800Mhz
    DRAM Timing Selectable ..................: [Manual]

    Standard Timing Control
    CAS Latency Time.........................: 5
    tRCD ....................................: 5
    tRP'.....................................: 5
    tRAS.....................................: 18

    Advanced Timing Control
    tRRD.....................................: 3
    tWTR.....................................: 3
    tWR......................................: 6
    tRFC.....................................: 52
    tRTP.....................................: 3
    Command Rate (CMD) ......................: 2


    Motherboard Voltage Control
    Voltage Type.............................: Manual

    CPU
    CPU Vcore................................: 1.35625V (normal is 1.2625v)
    CPU Termination..........................: Set 1.220
    CPU PLL..................................: Set 1.5
    CPU Reference............................: Auto

    MCH/ICH
    MCH Core.................................: 1.160
    MChReference............................: Auto (normal shows as 0.760V)
    MCH/DRAM Ref.............................: Auto (normal shows as 0.900V)
    ICH I/O..................................: auto (normal shows as 1.500V)


    DRAM
    DRAM Voltage.............................: 1.80

    DRAM Termination.........................: auto
    Channel A Reference......................: auto
    Channel B Reference......................: 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]

    ==============================================

    so whats the hardware the small FFT test taxes more than the large?

    i'm hitting 67 degress C also so quite hot, i have a feeling i could lower the cpu core v quite a bit cause it must be some other setting ... maybe the strap? i thought this was the conservtive setting though?

    cheers for any help guys

  8. #8
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    Default Re: OC on a EP43-DS3 with intel E7400

    just running another large FFt test now .. still going strong..

    but yeh i notice cpuz and cpuid hw monitor are report my cpu core volts as 1.31v at the mo

    could it just be that small FFT taxes cpu more.. so needs more volts on the cpu core?

    large is ment to run the system hotter right? but small is getting hotter faster at the mo, is that sign of a cpu core under stress?

    i'm on intel recomended limits of 1.36250 in bios so worried about going higher...but in windows thats 1.31 after vdrop and vdroop ... but what is the actual volts going through that core, bios or windows? is the bios setting off the mark a bit? seems weird.

  9. #9
    Lsdmeasap's Avatar
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    Default Re: OC on a EP43-DS3 with intel E7400

    You need to watch volts in windows, so you have plenty of room to add more in the BIOS. What you set in the BIOS for Vcore will always be less in windows, this is by Intel Design. It will be less at idle, this is called vdrop. And then it will be less then that at full load, this is called Vdroop

    But I would try adding a bit more MCH voltage, Termination, and Maybe ram to 1.85 as well as 1.8 may be less then that in windows.

    I always use Blend Orthos/prime so I am not sure. I think the Small FFt stress's the NB more, but don't quote me on that

    The strap has nothing to do with temps, it only sets your memory speeds. Vcore voltages and your cooler is all that affects your temps. Are you using stock cooler?

  10. #10
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    Default Re: OC on a EP43-DS3 with intel E7400

    hey thanks, no i'm using a zalman cnps7000b

    i think the small FFT test in prime stresses the cpu it's self most, almost no ram testing as instructions fit on the cache.

    ok so i'm kinda getting somewhere, have tried tweeking the four or so main voltages and ended up with these:

    vcore term mch time
    1 1.36 1.2 1.16 16min fail
    2 1.3625 1.2 1.1 20min fail
    3 1.3625 1.22 1.16 23min fail
    4 1.3625 1.22 1.1 37min fail
    5 1.3625 1.26 1.1 1hr 26min fail
    6 1.3625 1.28 1.1 19min fail
    7 1.36875 1.26 1.1 1hr 24min fail
    8 1.375 1.28 1.16 3hr 50min PASS
    9 1.36875 1.28 1.16 3hrs PASS
    10 1.3625 1.28 1.16 15min fail
    11 1.36875 1.28 1.1 1hr 27min fail
    12 1.375 1.28 1.1 4hrs PASS
    13 1.36875 1.28 1.1 20min fail


    so found i was pretty happy with cpu core1.375,cpu term 1.28, mch 1.1

    which ran happly for 4 hours before i stopped it, hitting about 70deg C though.

    then i added a 3rd hdd to my system, and ran the small FFT test again, and it failed after 19mins :/

    i notcied this was around the time my montior is set to go into sleep mode so wondered if this effects things? turned that off, still failed after an hour 20mins or so.

    i've bumped the MCH up to 1.16 now and the test is still running after an hour ..will see how this goes. are these prime95 test results meant to be consistant? i mean lets say you don't change anything system config wise - can you have a test run 4 hours plus without error, and then run it the next day and fail after 19mins?

    anyways ..will keep at it.

    does adding a HDD tax the MCH more?
    Last edited by sun-drop; 03-03-2009 at 11:00 AM.

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