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Thread: EP43-DS3LR questions




  1. #1

    Default EP43-DS3LR questions

    Hello all, this is my first post on these forums. I have to say there is tons of useful info here. I have many questions that can probably be answered here...

    Firstly, I am having trouble understanding (G) MCH Frequency Latch and System Memory Multiplier. Right now I have my E5200 @ 266 X 12.5 and I have my (G) MCH Frequency Latch and System Memory Multiplier set to auto. Previously, I had the (G) MCH Frequency Latch set to 266 Mhz and my system memory multiplier set to 4.00A. The settings I had prior to setting it to auto gave me the same readings in CPU-Z. If I understand correctly, changing the (G) MCH Frequency Latch and System Memory Multiplier affects FSB:DRAM ratio?

    After reading some of the article done by "Lsdmeasap" here --> http://forums.tweaktown.com/f69/giga...g-guide-26112/ I gained some knowledge in other areas but I'm still a little fuzzy on the MCH Frequency Latch and System Memory Multiplier.

    If someone could please explain to me in the simplest way what these settings do I would greatly apprecaite it. I don't know if I need to run my FSB:DRAM ratio at 1:1 instead of 1:2 (if it would make a difference). I've seen that most people prefer to have a 1:1 FSB:DRAM ratio (that is if you are not going for the highest core clock speed). What kind of settings would I need to use if I needed a 1:1 FSB:DRAM ratio instead of the 1:2 I have right now?

    My OCZ memory runs PC2-8500 @ 6-7-7-20 w/ 2.0v.

    Any help, comments, or input is greatly appreciated.

  2. #2

    Default Re: EP43-DS3LR questions

    Okay, I set my (G) MCH Frequency Latch to 333 and I set my System Memory Multiplier to 2.00B and I now have a 1:1 FSB:DRAM ratio. The funny thing is, in the benchmarks I've ran so far I do not see any performance increase from a 1:2 to a 1:1. My 3DMark06 results with a 1:2 were actually higher than my 1:1 ratio.

    I got 9606 with a 1:2 and I just got 9553 with the 1:1. I havn't tried superPi yet but I am going to see if there is any difference.

    Why the "****" does my board shut off and turn back on instantly when I change settings in the MIT? I'm no expert but wouldn't this be really bad for hardware? I've heard the worst thing you can do to electronics is shut them on and off, especially quickly. Think about it... hard drive spinning very quick, then shutting down, then spinning back up = not good for the life of your hardware. I don't like messing with settings in BIOS simply for this shutoff reason. I don't like my LCD shutting off and on real quick either - which happens also when changing OC settings. Hopefully someone can assure me that this is okay...

    Please give me some replies!

  3. #3
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    Default Re: EP43-DS3LR questions

    If you're running your processor with 266*12.5 and using a 1:1 ratio for the RAM, then you're severely under clocking your RAM to DDR-532.

    Use a memory multiplier that sets your RAM as close to DDR-1066 (533 actual) as possible. On a 266 bus this will be a 4.00 multi.

    Don't get too hung up on a 1:1 FSB:RAM ratio. There are performance gains over using other dividers, however only if you compare both with the same over all RAM frequency. Even then it's slight, with a probable minor reduction in latency. You would need to set a 533 FSB to get 1:1 at 1066, and there's virtually no way you'll get a E5200 to run on that kind of bus speed, regardless of multiplier.

    The board powes off when you change certain MIT settings because it needs to totally power off, sometimes to change automatically determined (not changable in bios) MCH latencies, among other reasons. this power off is the exact same kind of power off that happens when you shut down windows. Your LCD will power down then too, as will your HDD. It won't damage your components in the slightest, otherwise Gigabyte wouldn't program this behaviour into the board, I'm sure.
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  4. #4

    Default Re: EP43-DS3LR questions

    Psycho101, thank you for your reply and info. Based on your response, I'm assuming that if I set my (G) MCH Frequency Latch to 266 Mhz and System Memory Multiplier to 4.00A while doing 266 x 12.5 I would see better performance over the (G) MCH Frequency Latch @ 333 w/ a System Memory Multiplier of 2.00B?

    Would it be better to do a 1:2 FSB:DRAM ratio in my situation? - ie (G) MCH Frequency Latch @ 266 Mhz and then System Memory Multiplier @ 4.00A? I will not be taking my E5200 any further than 266 x 12.5

    Thank you so much for your input.

    //edit

    I changed the (G) MCH Frequency Latch back to 266 Mhz and the System Memory Multiplier to 4.00A and my SuperPi 1M results got better. It went from 18s to 16s when I changed from 333 Mhz & 2.00B to 266 Mhz & 4.00A. I guess I had my overclock set the way I needed it the whole time... Wow, I really still don't understand the System Memory Multiplier and (G) MCH Frequency Latch completely but I have a little bit better understanding of it. From what I understand, the settings allow systems with memory slower than the CPU's FSB to work correctly right? If someone has DDR2 800 RAM and a quad core that has 1333 Mhz FSB they use the MCH Frequency Latch and System Memory Multiplier to make their RAM work with that 1333 Mhz FSB? Someone please correct me if I'm wrong...
    Last edited by RoscoP; 05-25-2009 at 08:02 AM. Reason: I'm an idiot.

  5. #5
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    Default Re: EP43-DS3LR questions

    Ignore quoted bus speeds of "1333" or "1066" etc. The real FSB speed is that figure divided by 4. A "1333" FSB is really a 333 FSB, a "1066" FSB is really a 266 FSB.

    RAM is also quoted at its DDR clock speed. Its true frequency is half that. Eg DDR-800 runs at 400MHz, DDR-1066 runs at 533MHz.

    The system memory multiplier simply tells the board to run the memory at x * FSB, where x is half the system memory multiplier (because the mem multi number is based on DDR figures, not actual clocks). For example if you want your DDR 800 RAM (runs at 400MHz) to run at its rated speed on a 333 FSB, you use the 2.4 memory multiplier. 2.4/2 = 1.2 --> 1.2*333 = 400.

    It's impossible to make RAM run slower than the FSB on Intel motherboards. You have to either run your RAM at the same speed as the FSB, or faster.
    Last edited by Psycho101; 05-25-2009 at 09:10 AM.
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  6. #6

    Default Re: EP43-DS3LR questions

    The way the FSB strap (MCH Latch) and associated memory dividers (multipliers) work on the Intel chipset is actually pretty straight forward and designed to simplify the initial set up in non-overclocked situation only (Intel products were never designed to be overclocked ). All one needs to do is set the MCH Latch to match the rated FSB (actual, not QDR) of the CPU and this will narrow the available Memory Multipliers to only the ones that will result standard memory frequencies.

    Here's a chart that shows the MCH Latch/Memory Multiplier - memory frequency relationships on Gigabyte P45 boards.

    QX9650 batch L739A761/ GA-EP45-UD3P/ Kingston KHX9200 4x1G

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