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Thread: GA-EP45-UD3P (G)MCH Frequency Latch




  1. #1
    Join Date
    Jul 2009
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    Default GA-EP45-UD3P (G)MCH Frequency Latch

    First, let me say that I am very happy with my system. I am running an E8500 Intel and OCZ 1066 Reaper memory. The CPU is at 3.8 GH and the memory is at 1066. I have talked to another person that has the same set up except for the Memory. With mine I have the BIOS set up with the (G)MCH Frequency Latch at [AUTO] and my System Memory Multiplier 2.66. The 2.66 times the CPU Host Frequency 400 equals 1066. He has the (G)MCH Frequency Latch at 400MHz instead of [AUTO]. He has the CPU Host Frequency 375 and the System Memory Multiplier at 2.0. His Memory Frequency is 876. Shouldn't that be 2 times 375 = 750? What would happen if he changes the (G)MCH Frequency Latch to AUTO? What does the MCH Frequency Latch do?
    Last edited by WilliamP; 10-10-2009 at 01:52 AM.

  2. #2
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    Default Re: GA-EP45-UD3P (G)MCH Frequency Latch

    (G) MCH Frequency Latch enables different straps for different FSB speeds. For example the B strap is for FAB of 333-399 and the D strap is intended for FSB of 400+. There's no benefit to setting it off auto, other than that at for example 400MHz the board will only allow you to select the D multipliers for the SMM. Having it on Auto will allow you to cycle through all available.

    To summarise, Having (G) MCH set to 400 with a 2.66D multi is the same as having (G)MCH on Auto and a 2.66D multi. For the reason stated above, I always recommend setting (G) MCH to auto purely for convenience. Sometimes, the suggested strap, EG D strap won't work at the FSB speed set and another strap will. For example, I'm using the 2.66C strap and multi at 411 FSB, because the D strap (which is intended for 400+ FSB) simply will not allow me to boot, regardless of voltages and timings etc.
    Coolermaster CM 690 II advance Case
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  3. #3
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    Default Re: GA-EP45-UD3P (G)MCH Frequency Latch

    Thank you for the answer. I still don't understand how he use a CPU clock ratio of 375 and System Memory Multiplier of 2.0D and got a memory frequency of 876. I would think it should have been 750.

  4. #4
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    Default Re: GA-EP45-UD3P (G)MCH Frequency Latch

    If he's using 375 FSB and the 2.0 multiplier, then yes, he's getting DDR-750. If he's saying DDR-876, he's got it wrong somewhere. If using the 2.4B multi he'd be getting closer to 876, just over actually.
    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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