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Thread: what is "safe" Vcc?




  1. #11
    KayossZero's Avatar
    KayossZero is offline Junior Member
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    Feb 2009
    Location
    Jefferson, Maine
    Posts
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    Smile Re: what is "safe" Vcc?

    Quote Originally Posted by Psycho101 View Post
    Your processor, as with all 45nm dual cores and quads is rated up to 1.3625V, not 1.35V, as detailed here: Intel® Core?2 Duo Desktop Processor E8500 - SLB9K .

    PLL up to 1.65 is acceptable. Worth trying but 99% sure it will make little difference.

    I can't say if your temps are ok because as you said, they're uncalibrated readings, which are about as good as a chocolate fire guard. Unless your core sensors are stuck at idle, calibrating them is essential. If you look in my sig, mine are both stuck. One reads 34c and the other 39c even when underclocked to 1.6GHz at ~1V. My load temps appear to be good, but who knows what they really are?

    Use as much Vcore as you feel comfortable with. I must say though, if you need over 1.3625V for 3.8GHz on an E0 E8500, either you still need to tweak your settings or you got unlucky in a big way with the amount of OC headroom on that particular piece of silicon.
    My E8400 is the same way. Core 0 is 34C, Core 1 is 38C and they will never ever go below this (load temps they seem accurate and move accordingly) even with AC blasting right on the case so they're stuck.

    To the OP: an E0 *should be* a great OCer here are my settings for example.

    Code:
    ******************************
    MB Intelligent Tweaker(M.I.T.) 
    ******************************
    Robust Graphics Booster ..............: [Auto]
    CPU Clock Ratio ......................: [8X]
    x Fine CPU Clock Ratio................: +0.0
    CPU Frequency ........................: 4.26GHz (533x8.0)
    
    ********** Clock Chip Control ********
    
    >>>>>  Standard Clock Control
    CPU Host Clock Control................: [Enabled]
    x CPU Host Frequency(Mhz).............: [533]
    PCI Express Frequency(Mhz)............: [100]
    C.I.A.2...............................: [Disabled]
    
    >>>>> Advanced Clock Control..........: [Press Enter] 
    CPU Clock Drive.......................: [800mV]
    PCI Express Clock Drive...............: [900mV]
    CPU Clock Skew........................: [0ps]
    MCH Clock Skew........................: [0ps]
    
    ******** DRAM Performance Control ********
    
    Performance Enhance...................: [Standard]
    Extreme Memory Profile(X.M.P.)........: [Disabled]
    (G)MCH Frequency Latch................: [Auto]
    System Memory Multiplier (SPD)........: [2.00D]
    Memory Frequency(Mhz).....800.........: (1066)
    DRAM Timing Selectable (SPD)..........: [Manual]
    
    >>>>> Standard Timing Control
    x CAS Latency Time................5...: [5]
    x tRCD ...........................5...: [5]
    x tRP.............................5...: [5]
    x tRAS...........................18...: [15]
    
    >>>>> Advanced Timing Control.........: [Press Enter] 
    x tRRD............................3...: Auto
    x tWTR............................3...: Auto
    x tWR.............................6...: Auto
    x tRFC...........................52...: Auto
    x tRTP............................3...: Auto
    x Command Rate (CMD) .............0...: Auto
    
    >>>>> Channel A Timing Settings.......: [Press Enter] 
    x Static tRead Value..............11...: [10]
    x tRD Phase0 Adjustment...........0...: Auto
    x tRD Phase1 Adjustment...........0...: Auto
    x tRD Phase2 Adjustment ..........0...: Auto
    x tRD Phase3 Adjustment...........0...: Auto
    
    x Trd2rd(Different Rank)..........6...: Auto
    x Twr2wr(Different Rank)..........6...: Auto
    x Twr2rd(Different Rank)..........5...: Auto
    x Trd2wr(Same/Diff Rank)..........8...: Auto
    
    x DIMM1 Clock Skew Control (ps).......: Auto
    x DIMM2 Clock Skew Control (ps).......: Auto
    x DDR Write Training..................: Auto
    
    >>>>> Channel A Driving Settings......: [Press Enter] 
    x Driving Strength Profile............: [AUTO]
    
    x Data Driving Pull-Up Level..........: Auto
    x Cmd Driving Pull-Up level...........: Auto
    x Ctrl Driving Pull-Up Level..........: Auto
    x Clk Driving Pull-Up Level...........: Auto
    
    x Data Driving Pull-Down Level........: Auto
    x Cmd Driving Pull-Down level.........: Auto
    x Ctrl Driving Pull-Down Level........: Auto
    x Clk Driving Pull-Down Level.........: Auto
    
    >>>>> Channel B Timing Settings.......: [Press Enter] 
    x Static tRead Value..............11...: [10]
    x tRD Phase0 Adjustment...........0...: Auto
    x tRD Phase1 Adjustment...........0...: Auto
    x tRD Phase2 Adjustment ..........0...: Auto
    x tRD Phase3 Adjustment...........0...: Auto
    
    x Trd2rd(Different Rank)..........6...: Auto
    x Twr2wr(Different Rank)..........6...: Auto
    x Twr2rd(Different Rank)..........5...: Auto
    x Trd2wr(Same/Diff Rank)..........8...: Auto
    
    x DIMM1 Clock Skew Control (ps).......: Auto
    x DIMM2 Clock Skew Control (ps).......: Auto
    x DDR Write Training..................: Auto
    
    >>>>> Channel B Driving Settings......: [Press Enter] 
    x Driving Strength Profile............: [AUTO]
    
    x Data Driving Pull-Up Level..........: Auto
    x Cmd Driving Pull-Up level...........: Auto
    x Ctrl Driving Pull-Up Level..........: Auto
    x Clk Driving Pull-Up Level...........: Auto
    
    x Data Driving Pull-Down Level........: Auto
    x Cmd Driving Pull-Down level.........: Auto
    x Ctrl Driving Pull-Down Level........: Auto
    x Clk Driving Pull-Down Level.........: Auto
    
    ****** Motherboard Voltage Control ******
    
    Voltage Types..........Normal...........Current
    -----------------------------------------------
    >>> CPU
    Load-Line Calibration.................: [Enabled]
    CPU Vcore..............1.25000V.......: [1.36250V] 
    CPU Termination........1.200V.........: [1.300V]
    CPU PLL................1.500V.........: [1.570V] 
    CPU Reference..........0.760V.........: [Auto]
    >>> MCH/ICH
    MCH Core...............1.100V.........: [1.340V] 
    MCH Reference..........0.760V.........: [0.700V] (When CPU Term is @ 1.2 this is @ .700)
    MCH/DRAM Reference.....0.900V.........: [Auto]
    ICH I/O................1.500V.........: [1.500]
    ICH Core...............1.100V.........: [1.100]
    >>> DRAM
    DRAM Voltage...........1.800V.........: [2.120]
    DRAM Termination.......0.900V.........: [Auto]
    Channel A Reference....0.900V.........: [Auto]
    Channel B Reference....0.900V.........: [Auto]
    
    ******** Advanced BIOS Features ********
    Hard Disk Boot Priority...............: [Press Enter]
    First Boot Device.....................: [CDROM]
    Second Boot Device....................: [USB-CDROM]
    Third Boot Device.....................: [Hard Disk]
    Password Check........................: [Setup]
    HDD S.M.A.R.T. Capability.............: [Enabled]
    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) ...........: [Disabled]
    CPU EIST Function.....................: [Disabled]
    Virtualization Technology.............: [Disabled]
    Delay For HDD (Secs)..................: [0]
    Full Screen LOGO Show.................: [Disabled]
    Init Display First....................: [PEG]
    
    ******** Integrated Peripherals ********
    USB Keyboard Function.................: [Enabled]
    USB Mouse Function....................: [Enabled]
    USB Storage Function..................: [Disabled]
    Also, http://forums.tweaktown.com/f69/ga-e...-450fsb-31949/ this thread is the #1 thread on this site for UD3P/R (and anything remotely similar) I'd say and is a goldmine of information which helped me greatly.

  2. #12
    Join Date
    Jun 2009
    Posts
    57

    Default Re: what is "safe" Vcc?

    Quote Originally Posted by Psycho101 View Post
    I can't say if your temps are ok because as you said, they're uncalibrated readings, which are about as good as a chocolate fire guard. Unless your core sensors are stuck at idle, calibrating them is essential.
    calibrated RealTemp this past weekend,
    and to my lucky surprise a conservative idle adjustment of -7 was called for, and my sensors are not stuck.

    So, now I've decided to just see how much FSB I can get with Vcc=1.3625.

    Working on 9.0x460@2.00D tRD=8 4-5-5-13 right now...core temps are max. 61c.
    case: Gigabyte 'Triton 180'
    power: Corsair 'HX-620'
    motherboard: Gigabyte 'GA-EP45-UD3P' (rev.1.1, F9)
    cpu: Intel 'e8500' (E0)
    cooling: Xigmatek 'HDT-S1283'
    memory: OCZ 'Reaper' 4x2gb (OCZ2RPR10664GK)
    storage: Western Digital 'Black' (500gb)
    video: EVGA 'GeForce' GTX-260
    display: Samsung 'SyncMaster' 2333sw

  3. #13
    Join Date
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    J'Habite En Angleterre
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    Default Re: what is "safe" Vcc?

    With 1.3625V you should get well over 500 FSB if everything else is set right. You may want to back off on the Vcore though, as likely you'll just be generating an unacceptable level of heat with no benefit. I beleive Grishkafool, Boombasticsloth and D-an-W have gotten 500 FSB + with around 1.3V. Going higher in FSB or Vcore (I think BBS posted about this) resulted in temps that were too high.

    Notice that KayossZero is using 1.3625V as he's running a FSB of 533 with a 4.26GHz CPU speed. If temps are too high at those kind of settings, then 500*8.5 would give a virtually identical CPU clock, but likely with less Vcore needed and thus lower temps. Only drawback would be that you'd only get DDR-1000 out of your RAM if at 2.00D/B. This isn't much of a factor as performance loss is minimal. Not saying Kayoss should reduce the FSB or anything, just that if temps don't work out for you, lowering FSB and increasing multi reasonably is almost (5% benchmark difference, almost zero real world gain) as good.
    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

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