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core i7 950 OC problem

Discussion in 'Overclocking & Cooling' started by kayawish24, Aug 29, 2009.

  1. kayawish24 New Member

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    hello....
    (my system specs are below in my signature)

    Now i dont know that is my i7 950 D0 is bad batch or i am doing something wrong in overclocking.my Overclock is 10 hours prime95 stable @ 3.7GHz and the settings i used in bios are.

    23x multiplier
    BCLK 161
    DRAMFrequency 1614 MHz
    UCLK 3227 MHz

    8-8-8-21

    CPU VTT 1.22
    QPI 1.4
    Dram volts 1.54

    rest of everything is on AUTO and HT is also OFF /Turbo is also OFF
    on these settings my i7 950 @ 3.7GHz is stable more then 10 hours in prime95 blend test and NO errors but when i try to overclock my cpu to 4 GHz its even not stable @ 1.33v

    the settings i used for OC it to 4 GHz is same as above except Dram is running @ 1750 MHz and even its not stable if i run the ram @ 1450 MHz.even increasing / decresing Multi & Bclk is not stable @ 4ghz on 1.33v.so why my i7 950 requires such a high increase in CPUVTT from 3.7GHz to 4GHz.
    3.7GHz stable on 1.22v while for 4GHz it take more then 1.33v.why is this?
    __________________
    CPU: Intel Core i7 950 @ 3.7GHz w/o HT 1.22v 24/7 * | Cpu Cooler: Thermaright 120 ULTRA Xtreme | Board: ASUS P6t6 WS Revolution | Mem: 6GB DDR3 G.Skills PC3 16000 Running @ 1600 MHz 8-8-8-21 @ 1.54v QPI @ 1.4 | GPU: Nvidia 3 x XFX GTX 260 Core 216 3-WAY SLI @ 700/1250/1431 (Core/Memory/Shader)
    | HDD:- 640GB S-ATA Seagate Baracuda 32 Mb Cache 7200 Rpm | Cassing: NZXT Tempest *BIG TOWER*
    PSU: Xigmatik NRP 1500 Watts
     
  2. WSP

    WSP New Member

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    Problems with temps?whats ur temp when running@3.7g?

    Beware though.running prime95 for 10hours might killed you mobo
     
  3. kayawish24 New Member

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    what how can running prime 95 for 10 hours kill my mobo? and @ 3.7ghz load temps were 60-65C in all four cores with HT off and now i am trieing for 4 ghz and temps are 68-73C @ 1.34v and prime95 blend test is running.my idle temps are mostly 44-46C
     
  4. WSP

    WSP New Member

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    Well,some guys @xtremesystems forums killed their mobo when running prime95 for 8hours.

    It got stable when doing prime for 8hours,and when he wants to reboot he got bsod and his mobo died.

    Just like the software said,it is a stressing program ;)
     
  5. kayawish24 New Member

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    may be there temps were too high.
     
  6. mastrdrver

    mastrdrver

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    How do you have cpu vvt and qpi listed as 2 different voltages? On Asus x58 boards: qpi/vdram = vvt.

    Do you mean its taking a lot of vcore? Also, are you getting any BSOD and what are the error codes?
     
  7. kayawish24 New Member

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    sory by cpu vtt i mean Vcore.i get BSOD after 2 hours running i7 950 @ 4ghz on 1.35Vcore & 1.4 QPI.Ram is rated for 2000MHz but it wont boot my system thats y i am running it on 1740 MHz and still i got BSOD.i think my Batch is A which very bad so i am still working for 4 ghz OC otherwise i will stay with 3.7GHz OC which is rock solid
     
  8. mastrdrver

    mastrdrver

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    A batches aren't inherently bad. I've got a 3903A and it does 21x200 on ~1.2875v in bios.

    Can you list your settings? Use this templet I got off i4memory

    Code:
    AI Tweaker
    ****************************
    AI Overclock Tuner: AUTO
    CPU Ratio Setting: AUTO
    BCLK Frequency: 133
    PCIE Frequency: 100
    DRAM Frequency: AUTO
    UCLK Frequency: AUTO
    QPI Link Data Rate: AUTO
    
    *******************
    DRAM Timing Control
    *******************
    DRAM CAS Latency: AUTO
    DRAM RAS# to CAS# Delay : AUTO
    DRAM RAS# PRE Time: AUTO
    DRAM RAS# ACT Time: AUTO
    DRAM RAS# to RAS# Delay: AUTO
    DRAM REF Cycle Time: AUTO
    DRAM WRITE Recovery Time: AUTO
    DRAM READ to PRE Time: AUTO
    DRAM FOUR ACT WIN Time: AUTO
    DRAM Back-To-Back CAS# Delay: AUTO
    
    DRAM Timing Mode: AUTO
    DRAM Round Trip Latency on CHA: AUTO
    DRAM Round Trip Latency on CHB: AUTO
    DRAM Round Trip Latency on CHC: AUTO
    
    DRAM WRITE To READ Delay(DD): AUTO
    DRAM WRITE To READ Delay(DR): AUTO
    DRAM WRITE To READ Delay(SR): AUTO
    DRAM READ To WRITE Delay (DD): AUTO
    DRAM READ To WRITE Delay (DR): AUTO
    DRAM READ To WRITE Delay (SR): AUTO
    DRAM READ To READ Delay(DD): AUTO
    DRAM READ To READ Delay(DR): AUTO
    DRAM READ To READ Delay(SR): AUTO
    DRAM WRITE To WRITE Delay(DD): AUTO
    DRAM WRITE To WRITE Delay(DR): AUTO
    DRAM WRITE To WRITE Delay(SR): AUTO
    
    ****************************
    CPU Voltage: AUTO
    CPU PLL Voltage: AUTO
    QPI/DRAM Core Voltage: AUTO
    IOH Voltage: AUTO
    IOH PCIE Voltage: AUTO
    ICH Voltage: AUTO
    ICH PCIE Voltage: AUTO
    DRAM Bus Voltage: AUTO
    DRAM DATA REF Voltage on CHA: AUTO
    DRAM CTRL REF Voltage on CHA: AUTO
    DRAM DATA REF Voltage on CHB: AUTO
    DRAM CTRL REF Voltage on CHB: AUTO
    DRAM DATA REF Voltage on CHC: AUTO
    DRAM CTRL REF Voltage on CHC: AUTO
    ****************************
    Load-Line Calibration: AUTO
    CPU Differential Amplitude: AUTO
    CPU Clock Skew: AUTO
    CPU Spread Spectrum: AUTO
    IOH Clock Skew: AUTO
    PCIE Spread Spectrum: AUTO
    
    CPU Advance Settings
    C1E Support: Enabled
    Hardware Prefetcher: Enabled
    Adjacent Cache Line Prefetcher: Enabled
    Intel (R) Virtualization Tech: Enabled
    CPU TM Function: Enabled
    Execute Disable Bit: Enabled
    Intel (R) HT Technology: Enabled
    Active Processor Cores: ALL
    A20M: Disabled
    Intel (R) C-State Tech: Enabled
    ****************************
    Express Gate: Disabled
     
  9. johnnyfiive

    johnnyfiive

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    Mast, is yours a 3903A468? Mine is and 4.0 requires 1.32v+ :(
     
  10. mastrdrver

    mastrdrver

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    Sure is Johnny. What is your pack date, if you know? Mine is 5/15/09

    Have you tried relaxing your uncore? I've been messing a little today and did 20x200 with 1.25 for ~20 minutes. Nothing great for OOCT Linpack, but couldn't do that before. All I did was relax my uncore from 3600 to 3200. Still have my memory at 1600 8-8-8-21 90tRFC. Here are some settings for my P6T6.

    Code:
    AI Tweaker
    ****************************
    AI Overclock Tuner: Manual
    CPU Ratio Setting: 20x
    BCLK Frequency: 200
    PCIE Frequency: 100
    DRAM Frequency: 8x
    UCLK Frequency: 16x
    QPI Link Data Rate: 18x
    
    *******************
    DRAM Timing Control
    *******************
    DRAM CAS Latency: 8
    DRAM RAS# to CAS# Delay : 8
    DRAM RAS# PRE Time: 8
    DRAM RAS# ACT Time: 21
    DRAM RAS# to RAS# Delay: AUTO
    DRAM REF Cycle Time: 90
    DRAM WRITE Recovery Time: AUTO
    DRAM READ to PRE Time: AUTO
    DRAM FOUR ACT WIN Time: AUTO
    DRAM Back-To-Back CAS# Delay: AUTO (Believed to be 4)
    
    DRAM Timing Mode: 1N
    DRAM Round Trip Latency on CHA: Normal (55)
    DRAM Round Trip Latency on CHB: Normal (56)
    DRAM Round Trip Latency on CHC: Normal (57)
    
    DRAM WRITE To READ Delay(DD): AUTO
    DRAM WRITE To READ Delay(DR): AUTO
    DRAM WRITE To READ Delay(SR): AUTO
    DRAM READ To WRITE Delay (DD): AUTO
    DRAM READ To WRITE Delay (DR): AUTO
    DRAM READ To WRITE Delay (SR): AUTO
    DRAM READ To READ Delay(DD): AUTO
    DRAM READ To READ Delay(DR): AUTO
    DRAM READ To READ Delay(SR): AUTO
    DRAM WRITE To WRITE Delay(DD): AUTO
    DRAM WRITE To WRITE Delay(DR): AUTO
    DRAM WRITE To WRITE Delay(SR): AUTO
    
    ****************************
    CPU Voltage: 1.25
    CPU PLL Voltage: 1.8
    QPI/DRAM Core Voltage: 1.28750
    IOH Voltage: 1.22
    IOH PCIE Voltage: 1.58
    ICH Voltage: 1.1
    ICH PCIE Voltage: 1.5
    DRAM Bus Voltage: 1.64
    DRAM DATA REF Voltage on CHA: AUTO
    DRAM CTRL REF Voltage on CHA: AUTO
    DRAM DATA REF Voltage on CHB: AUTO
    DRAM CTRL REF Voltage on CHB: AUTO
    DRAM DATA REF Voltage on CHC: AUTO
    DRAM CTRL REF Voltage on CHC: AUTO
    ****************************
    Load-Line Calibration: Enabled
    CPU Differential Amplitude: AUTO
    CPU Clock Skew: Auto
    CPU Spread Spectrum: Disabled
    IOH Clock Skew: Auto
    PCIE Spread Spectrum: Disabled
    
    CPU Advance Settings
    C1E Support: Disabled
    Hardware Prefetcher: Enabled
    Adjacent Cache Line Prefetcher: Enabled
    Intel (R) Virtualization Tech: Disabled
    CPU TM Function: Disabled
    Execute Disable Bit: Disabled
    Intel (R) HT Technology: Enabled
    Active Processor Cores: ALL
    A20M: Disabled
    Intel (R) C-State Tech: Disabled
    ****************************
    Express Gate: Disabled
    Like I said, I can do higher on the uncore, but it seems to just eat voltage on QPI/vDram (vvt) and vCore.
     
  11. johnnyfiive

    johnnyfiive

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    My pack date is same as yours mastr, I've tried 1600 mem/3200 uncore. Still falls on its face during prime. I have a DFI T3EH8 btw.
     
  12. mastrdrver

    mastrdrver

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    Don't know then. Maybe its the power supply. :shrugs:
     
  13. johnnyfiive

    johnnyfiive

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    I have a 850w Thermaltake ToughPower XT, definitely not PSU. I'll have to bust out my multimeter :)
     
  14. mastrdrver

    mastrdrver

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    Hmmm, believe it or not it maybe the board. Evga has both of our boards and noted this with the same processor:

    http://i4memory.com/117786-post4.html
     
  15. mastrdrver

    mastrdrver

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    Johnny! Start over!

    I just ran LinX 0.6.1 with 60 loops of ~4800mb of memory with 200bclk, 3200 uncore, and 3600 qpi with.....1.225v vvt! No errors and was still going. I only had the core at 3200, but I was amazed at the low voltage needed from vvt. I'm working on messing with 4ghz though. Also had 1600 on the memory with 8-8-8-21 1T timings and I would bet I could go 7-7-7-x 1T without a problem.
     

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