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Thread: FSB vs multiplier question




  1. #1
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    Default FSB vs multiplier question

    Ok, so I have been running a GA-EP45-UD3P with a Q6600 at 3.6 and it seemed stable but I decided to run some prime95 on it for some testing. Crashed almost immediately. I currently have it at 3.2 and I seem to be able to run prime95 as long as I want (it's runnning as I type this). The question is this:
    Currently running 8x400 at 1.45 vcore, 1.3 cpu termination, 1.2 mch 2.0 RAM (these are the defaults for auto and seem to work fine at this speed). If I want to run 9x400, the fsb isn't changing, so do I need to change anything but vcore and maybe cpu termination? If the fsb is stable at this multiplier, would I need to change the RAM timings or voltage or mch to run the same bus with a different multiplier?

  2. #2
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    Default Re: FSB vs multiplier question

    You may have to change any and all settings to get that 9* multi working. Your FSB may be stable enough to allow a CPU to communicate down it at 3.2GHz, but could not be sufficiently so for 3.6GHz.

    I'd also take Vcore, CPU Termination and PLL off auto. You're not going to get to the edge of CPU performance with what the board will set, and it is known for going nuts on auto at some frequencies.

    Try 1.45V with LLC on, change CPU Term from 1.3V up to 1.45V, Pll can be set up to 1.61V with safety, and a smidge more if you're feeling brave.

    You likely won't have to change RAM timings, though it is possible. Anything's possible. MCH Core Voltage may need altering too, or maybe not.

    Sorry I can't offer any definite advice, but with natural variation of components, PSU voltage quality (noise, ripple, voltage regulation etc) it's impossible to be sure.
    Coolermaster CM 690 II advance Case
    Corsair HX750 (CWT, 91%(80+ Gold rated @230V) single 62A 12V rail
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    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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  3. #3
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    Default Re: FSB vs multiplier question

    Thanks for the reply. I was only testing auto on 3.2 because ot seems to work at that speed. Volts get really high if you clock it up on auto.

    Is it safe to match vcore and CPU Term at 1.45 with llc on?

  4. #4
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    Default Re: FSB vs multiplier question

    Yes, 1.45V CPU term should be fine, use caution going over 1.5V with it.

    You should also be good to go to 1.5Vcore, as long as temps are OK, however at 3.6GHz with 1.5V you'd need a really good cooler combined with low ambient temps.
    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

  5. #5
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    Default Re: FSB vs multiplier question

    Thanks, I'll keep that in mind. I've been stressing it at 1.4 CPU Term and seems to be good so far. If it craps out I'll go higher.

  6. #6
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    Default Re: FSB vs multiplier question

    probably best to specify what your components are..do a qwik signature even if not going to fill in the bios sheet.
    Current Systems:

    Asrock p67 Extreme6.............. Gigabyte EP-45 UD3 ...................... Gigabyte 73 PVM S2
    Intel i5 2500k 4.8ghz................ Intel Q8400 3.8ghz......................... Intel D820 2.8ghz
    Zalman 10x cooler.................... Coolermaster V8............................ HP cooler
    8GB Gskill ripjaw ddr3.............. 4GB Gskill PI ddr2.......................... 4GB samsung ddr2
    60GB ssd/500GB HDD .............. WD 1TB hdd.................................... Seagate 160GB hdd
    GTX 460 1GB x2 SLI ................. Msi 9600GT 512MB(died) ........... Onboard gx
    Win7 64 ,750w psu(ocz)............ Win7 64 ,520w psu,seasonic...... Win XP pro ,400w psu

    HEC 6A34 case . ....................... Jeantec R2 case............................ Packard Bell case

    hoping to upgrade to http://www.thinkgeek.com/stuff/41/habicase.shtml
    http://www.flixya.com/video/140325/Animal-launching

  7. #7
    Join Date
    Mar 2009
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    Default Re: FSB vs multiplier question

    Ok, here's one I copied from someone and put in my settings IIRC. I added a sig a while ago, maybe I have to post again for it to show...
    It seems to be running fairly well at this point, unless someone sees something that is just wrong.

    **************************************
    **************************************
    Gigabyte GA-EP45-UD3P (Rev. 1.0) - F9a
    **************************************
    **************************************
    ******************************
    MB Intelligent Tweaker(M.I.T.)
    ******************************
    Robust Graphics Booster ..............: [Fast]
    CPU Clock Ratio ......................: [9X]
    x Fine CPU Clock Ratio................: +0.0
    CPU Frequency ........................: 3.60GHz(400x9)
    ********** Clock Chip Control ********
    >>>>> Standard Clock Control
    CPU Host Clock Control................: [Enabled]
    x CPU Host Frequency(Mhz).............: [400]
    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...................: [Turbo]
    Extreme Memory Profile(X.M.P.)........: [Disabled]
    (G)MCH Frequency Latch................: [Auto]
    System Memory Multiplier (SPD)........: [2.00B]
    Memory Frequency(Mhz).....800.........: 800
    DRAM Timing Selectable (SPD)..........: [Manual]
    >>>>> Standard Timing Control
    x CAS Latency Time................5...: [ 4]
    x tRCD ...........................5...: [ 4]
    x tRP.............................5...: [ 4]
    x tRAS...........................18...: [12]
    >>>>> Advanced Timing Control.........: [Press Enter]
    x tRRD............................3...: [ 3]
    x tWTR............................3...: [ 4]
    x tWR.............................6...: [ 6]
    x tRFC...........................52...: [68]
    x tRTP............................3...: [ 3]
    x Command Rate (CMD) .............0...: [ 2]
    >>>>> Channel A Timing Settings.......: [Press Enter]
    x Static tRead Value.............10...: [ 8]
    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............: [800MHz]
    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.............10...: [ 8]
    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............: [800MHz]
    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..............1.27500V.......: [1.450V]
    CPU Termination........1.200V.........: [1.400V]
    CPU PLL................1.500V.........: [1.610V]
    CPU Reference..........0.760V.........: [Auto]
    >>> MCH/ICH
    MCH Core...............1.100V.........: [1.300V]
    MCH Reference..........0.760V.........: [Auto]
    MCH/DRAM Reference.....0.900V.........: [Auto]
    ICH I/O................1.500V.........: [1.500V]
    ICH Core...............1.100V.........: [1.100V]
    >>> DRAM
    DRAM Voltage...........1.800V.........: [2.000V]
    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.....................: [Floppy]
    Second Boot Device....................: [Hard Disk]
    Third Boot Device.....................: [CDROM]
    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) ...........: [Enabled]
    CPU EIST Function.....................: [Disabled]
    Virtualization Technology.............: [Enabled]
    Delay For HDD (Secs)..................: [ 0]
    Full Screen LOGO Show.................: [Enabled]
    Init Display First....................: [PEG]
    ******** Integrated Peripherals ********
    USB Keyboard Function.................: [Enabled]
    USB Mouse Function....................: [Disabled]
    USB Storage Function..................: [Disabled]
    Gigabyte GA-EP45-UD3P v1.0 F10 Bios
    Prolimatech Megahalems rev. B & 2 * Cooler Master R4 fans
    Intel Core2 Quad Q9550 @4.0 (8.5 * 475)
    2x2GB Mushkin 991619 (PC2-8500) 5-5-5-15
    XFX Radeon HD 4870x2 | Samsung 275T+
    WD Caviar Black 640GB x2 RAID 0 | Windows 7 x64
    Antec SG-850 | Logitech G19 Keyboard & G500 Mouse

  8. #8
    Join Date
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    Default Re: FSB vs multiplier question

    Seems pretty good to me.

    If it proves stable undre Prime95 and IBT, then I'd save the profile to the BIOS so you can re-load it again if needed.

    When you get stability, you may very well be able to increase your RAM performance. Trying the 2.00D strap with a tRead of 7 might be successful. 2.00D lets me use a lower tRead than 2.00B so it may work for you too.

    Also work on lowering your Advanced Timings. Something like 3-3-5-48-3 may prove stable, and you may be able to go even lower.
    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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