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Thread: (G)MCH Strapping / Frequency Latch




  1. #11
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    Default Re: (G)MCH Strapping / Frequency Latch

    Quote Originally Posted by Psycho101 View Post
    Which strap you have to use depends on your current FSB. If you had it at stock 333 FSB, you'd be using 2.4B to get PC2-6400 speeds. At 400 FSB you could use either 2.00D or 2.00B and it would give the same PC2-6400 (DDR-800) speed, even though 2.00B is actually intended for running DDR-667 (pc2-5300) RAM at its rated speed.

    Usually, if you're running a FSB 400MHz or more, use D. If you're running a stock 333 FSB, then use the most apropriate B multiplier for your RAM.

    I think I understand now. So what's the story on "C" is that like a legacy
    FSB of 200?

    Thanks all for the help!! so many different speeds
    back in the day.. there was one bus speed... and we liked it!!

    -devoh
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  2. #12
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    Default Re: (G)MCH Strapping / Frequency Latch

    The C straps would be used to get your RAM running at corect speeds witha 200 MHz FSB processor like an E5200 for example.

    It's not always logical though. If I want to run a 400 FSB with 2.8GHz on the processor I have to set 2.66C to get my RAM at 1066. 2.66D simply does not work. Completely non-functional regardless of voltages and tRead values etc. YMMV
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  3. #13
    kick's Avatar
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    Default Re: (G)MCH Strapping / Frequency Latch

    Dont get too hung up on the letters.
    Youve bought a board with a lot of adjustments,so you want to tune the system in bios.
    Once you set the cpu reference frequency it determines 3 things:
    the cpu speed (with possible adjustment by you)
    the front side bus speed (no adjustment possible in bios)
    the memory speed (with possible adjustment by you).

    Taking air cooling as a given (most of us here) on intel 45 chipset and 775 socket.
    Were using 470-510 cpu ref frequency (quads)
    470-530 cpu ref frequency (duals).
    Generally you want to get the cpu running as fast as possible(stable) ,with the highest fsb possible,depending on your memory.

    The only memory multipliers that will be of much use to you are B and D 2:00 (2xcpu ref frequency)2:40(2.4x cpu ref frequency)and maybe 2:66(2.66x cpu reference frequency)

    Lets say u leave your cpu reference frequency at 450mhz
    use x8 on your cpu, and the 2.4 memory multiplier.
    That should give you
    3600mhz cpu speed
    1800mhz fsb speed
    1080mhz ddr2 memory speed
    memory bandwidth around 7000Mb/s read?

    Trying cpu reference frequency of 500mhz and drop cpu multiplier to x7 and using a 2:00 multiplier for memory.
    3500mhz cpu speed
    2000mhz fsb speed
    1000mhz ddr2 memory speed
    memory bandwidth around 8500Mb/s read?

    Thats just a rough approximation example :no mention of voltages/timings etc:.Maybe your cpu would be happy at 8 x500 at 4000mhz.But even with a 7 multiplier and running at 100mhz less ,running your memory below its stated speed can provide more performance if the front side bus speed is higher.
    Last edited by kick; 05-20-2009 at 12:57 AM.
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  4. #14
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    Default Re: (G)MCH Strapping / Frequency Latch

    Quote Originally Posted by kick View Post
    Dont get too hung up on the letters.
    Trying cpu reference frequency of 500mhz and drop cpu multiplier to x7 and using a 2:00 multiplier for memory.
    3500mhz cpu speed
    2000mhz fsb speed
    1000mhz ddr2 memory speed
    memory bandwidth around 8500Mb/s read?

    Thats just a rough approximation example :no mention of voltages/timings etc:.Maybe your cpu would be happy at 8 x500 at 4000mhz.But even with a 7 multiplier and running at 100mhz less ,running your memory below its stated speed can provide more performance if the front side bus speed is higher.
    Results with SiSoft Sandra 2009.SP2

    I seem to be getting some real nice memory speeds from 2.00D and a 500FSB (well 502 at the moment) So my memory is running @ 1004Mhz
    9.28GB/s with a 68ns random access.

    If I use 2.66D with a 408Mhz FSB(to keep the core @ 3.5Ghz for both tests). So my memory is running @ 1086Mhz. I only get 8.37GB/s with 78ns ramdom access.

    So even though in the second example I have a faster memory speed, I get a much faster memory access and transfer speeds using a slower memory speed with a higher FSB and a 1:1 ratio.. fasinating! Faster memory does not necessarly make for faster random acess and transfer speeds. Not what you would expect.. well not me at least.

    Just like you said it would be.

    -devoh
    Antec P180 case
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    2 x WD Black Edition 640G 32Megs cache 7200RPM
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  5. #15
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    Default Re: (G)MCH Strapping / Frequency Latch

    Well I have gotten to 515FSB with a 2.00D and a 9 tRD. I can go higher
    but not without losing my 9 tRD and some larger bumps to the MCH... so I'm pretty much at the point of diminishing returns. My goal is 4 to 4.2Ghz so with being able to use multipliers up to 9.5 I'm all set to start pushing the CPU.

    -Devoh
    Antec P180 case
    Intel E8500 E0 Stepping
    Gigabyte GA-EP45-UD3P rev 1.1 BIOS F10j
    Thermalright Ultra eXtreme 120!! Do NOT try and save a few bucks with your cooler.
    Crucial Ballistic PC6400 cas 4 memory 2 x 2G
    2 x WD Black Edition 640G 32Megs cache 7200RPM
    XFX Geforce 260/216 Black Edition
    Corsair TX650W
    Running on 64 bit Win 7 (AHCI mode)

  6. #16
    Lsdmeasap's Avatar
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    Default Re: (G)MCH Strapping / Frequency Latch

    Keep in mind MCH, Vtt, and ram voltages affect what tRD and strap you can use, and memory throughput scores as well

  7. #17
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    Default Re: (G)MCH Strapping / Frequency Latch

    Indeed. ^^^^^

    One thing I would like to ask Lsdmeasap if I can. Regarding me not being able to get the propper 2.66x strap working. I have tried all sorts of voltage combos for VTT, MCH, Ref volts on CPU and MCH etc, and it simply didn't work with either sets of RAM I have (Corsair XMS2 6400-C5 and 8500C5, the 8500 is stable at 4-4-4-12 DDR 800, tried 5-5-5-18 too.)

    I heard mention one memory multi may be a bit buggy, not sure if it's the 2.66 one or not. My original mentioning of this strange happening (not a problem as I can use the C strap fine) is quoted below:

    It's not always logical though. If I want to run a 400 FSB with 2.8GHz on the processor I have to set 2.66C to get my RAM at 1066. 2.66D simply does not work. Completely non-functional regardless of voltages and tRead values etc. YMMV
    Coolermaster CM 690 II advance Case
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  8. #18
    Lsdmeasap's Avatar
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    Default Re: (G)MCH Strapping / Frequency Latch

    I can use 2.66D on my P45 board so I don't think it is glitchy, you can see in my Crucial Review I used it a few times (A the end MAX Clock section)

    Then again it could be in your BIOS? Have you tried other BIOS's and it is always the same? Have you tried 401 FSB, or greater, instead of 400?

    Have you messed with MCH Ref amount, that could help as well.

  9. #19
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    Default Re: (G)MCH Strapping / Frequency Latch

    I tried F4 (original BIOS) F6 and F9, all with the same strange issue..

    Also in an effort to be systematic, I changed MCH Core, MCH ref, CPU ref, PLL and VTT, one at a time, both up and down, every combination. I also then started combining changes, like one notch on MCH ref at 1.200 VTT, then changing another voltage through all possible combos, adjusting MCH Ref again, andd trying all combos.

    In the end I spent around 5-6 hours trying to see if it would work. I even had a spread sheet to work out all possible combinations of the five voltages. I didn't change MCH/DRAM ref, or the two channel refs, as even if they're set to 0.5*VDIMM , bad things happen. They only work on auto.
    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

  10. #20
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    Default Re: (G)MCH Strapping / Frequency Latch

    Quote Originally Posted by Psycho101 View Post
    I tried F4 (original BIOS) F6 and F9, all with the same strange issue..

    Also in an effort to be systematic, I changed MCH Core, MCH ref, CPU ref, PLL and VTT, one at a time, both up and down, every combination. I also then started combining changes, like one notch on MCH ref at 1.200 VTT, then changing another voltage through all possible combos, adjusting MCH Ref again, andd trying all combos.

    In the end I spent around 5-6 hours trying to see if it would work. I even had a spread sheet to work out all possible combinations of the five voltages. I didn't change MCH/DRAM ref, or the two channel refs, as even if they're set to 0.5*VDIMM , bad things happen. They only work on auto.

    wow do you have any hair left after all that?
    Antec P180 case
    Intel E8500 E0 Stepping
    Gigabyte GA-EP45-UD3P rev 1.1 BIOS F10j
    Thermalright Ultra eXtreme 120!! Do NOT try and save a few bucks with your cooler.
    Crucial Ballistic PC6400 cas 4 memory 2 x 2G
    2 x WD Black Edition 640G 32Megs cache 7200RPM
    XFX Geforce 260/216 Black Edition
    Corsair TX650W
    Running on 64 bit Win 7 (AHCI mode)

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