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Thread: EP45-DSR3 MCH Voltage with Corsair Memory




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    Default EP45-DSR3 MCH Voltage with Corsair Memory

    I hope someone can help me out with some troubleshooting. I have an EP45-DS3R with an Intel Q9450 overclocked at 3.2GHz and 8GB of Corsair Dominator PC8500 memory. I've had a hard time getting the memory to pass Memtest 86+ without raising the voltage above stock for EPP timings. It's supposed to operate at 5-5-5-15 2T at 2.1V. I get errors unless I bump the voltage. I've had one pair replaced already and the replacements gave the same results so it is very unlikely it is bad memory. In order to get them to pass I was having to use 2.2V. Last night, on the replacements I got a pair to pass at 2.16V in the BIOS (actual voltage is 2.13V due to Vdroop I guess). by increasing the MCH voltage from the default of 1.1V to 1.16V. I've read that other motherboards are using 1.4V and 1.5V but before I change anything and see if that is the culprit, does anyone here have any advice? Thanks.

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    Ya, you need more MCH for sure for 8Gb. 1.1 to 1.16 is not enough at all. I suggest trying 1.2-1.3, other then that what trfc and static tRead Values are you using?

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    Ok. I just set my MCH for 1.26V. Both trfc and static tRead are set to "auto" The "normal" values listed are 68 and 10, respectively. I'm assuming that I should change these to something else?

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    for 8GB you should use Manual setting of trfc of 62-68, and static tRead Value of 7-12 will likely be fine (As would AUTO there). But I would for sure be doing some manual tests with the trfc.

    What you see on the left is not always what AUTO gives you, it is just what the BIOS happens to be using at the time. I always suggest to Never use AUTO on any setting, those are set for those who do not know or are just starting a system. AUTO is SURELY not going to get you far with 8GB

    You may need 1.3/1.35 or 1.4 MCH for 8GB. I use +2 for 4GB always so you will at least need that + some

    Do you have XMP disabled, and Performance Enhance on Standard? If not do both of those for sure as well.

    Also disable Legacy USB Storage Detect if you are not using a External USB disk

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    First, thanks for your advice thus far. In a minute I'll go ahead and reboot and change those settings. Can you also provide good advice, if you happen to know, on other voltage settings and timing settings (there are a bunch in the memory section) that might help me get a stable 3.4GHz overclock (stable meaning passing Prime95). There are bunch of other settings I can manually change that are on Auto. For example -

    CPU VCore
    CPU Termination
    CPU PLL
    CPU Reference

    MCH Core (I'll change to 1.35)
    MCH Reference
    MCH/DRAM Reference
    ICH/IO

    DRAM (set to 2.16 which gives me 2.13 after Vdroop)
    DRAM Termination
    Channel A Reference
    Channel B Reference

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    Well I tried those settings and didn't work quite well. When I went to 1.34 on the MCH and then changed the RAM timing settings there was a hiccup when I rebooted but it rebooted ok the second time. Then when running Prime, after passing the 8k FFT test my computer froze and I had to do a hard restart. I dropped the MCH down to 1.32 to see if that's the issue. Any thoughts? Do you think that is the problem or the memory timings? Trfc is at 65 and static tread is at 10

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    It should double boot often times when you change certain things in the BIOS, this is normal. A Triple reboot to default clocks is not, a double boot to the settings you set is normal. Just so you know this, as it sounds like it may have only double booted and you just did not know this is normal

    Try static tRead at 12 for now but 10 should be ok down the road. trfc may need 72 you will just have to try. Here is some settings I would try starting with, you may need to go higher maybe not. Just keep in mind higher wont hurt anything to try timingwise so you can try anything you like in that sense.

    CAS Latency Time........................5
    tRCD .........................................5
    tRP'...........................................5
    tRAS..........................................15

    I know you should likely not HAVE TO, but with my thought on this rams incompatibility and using 8GB you may want to try 6-6-6-15/18 just to see if it fairs any better for you over 5-5-5-12/15

    Remember you can raise any of these above what I am suggesting and not harm anything, only overvolting things to much can hurt your system. Not timings

    Advanced Timing Control
    tRRD...........................................3-4
    tWTR..........................................12-15
    tWR............................................3-5
    tRFC...........................................62-72
    tRTP...........................................3-6
    Command Rate (CMD) ....................:2

    Channel A
    Static tRead Value.........................:7-12
    tRD Phase0 Adjustment...................:<<< Leave for all below as well
    tRD Phase1 Adjustment...................:Auto
    tRD Phase2 Adjustment .................:Auto
    tRD Phase3 Adjustment..................:Auto
    Trd2rd(Different Rank)....................:Auto
    Twr2wr(Different Rank)...................:Auto
    Twr2rd(Different Rank)...................:Auto
    Trd2wr(Same/Diff Rank)..................:Auto
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps

    Channel B
    Static tRead Value.........................:7-12
    tRD Phase0 Adjustment...................:<<< Leave for all below as well
    tRD Phase1 Adjustment...................:Auto
    tRD Phase2 Adjustment .................:Auto
    tRD Phase3 Adjustment..................:Auto
    Trd2rd(Different Rank)....................:Auto
    Twr2wr(Different Rank)...................:Auto
    Twr2rd(Different Rank)...................:Auto
    Trd2wr(Same/Diff Rank)..................:Auto
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps

    CPU vCore is all up to you and your chip, 1.365 is the Intel recommended max but you should not need anything close to that without going above 3.6 or so. This also depends on your CPU cooler, if you dont have a good one you wont be able to overclock much above 3.6 or so because of heat and voltage needed

    Here is some general info on the other CPU voltages (I do not have a P45 so I cannot say for sure what would be a suggested range. Same applies with the other "Reference" voltages.... I am not sure so I will not make a suggestion) >>>

    AnandTech: ASUS Striker II Extreme: Mucho Bang, Mucho Bucks

    Adjusting A/GTL+ Levels for Increased FSB Signaling Margins and Overclocking - The Tech Repository Forums

    Global Edge Of Stability

    http://www.clunk.org.uk/forums/revie...html#post24996
    Last edited by Lsdmeasap; 08-08-2008 at 12:23 PM.

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    Ok...I made the other changes and things seem to be stable. It did make a difference for the better it seems. Now I just have to nail down the MCH Voltage issue and then try the 3.4GHz test again and hope it passes and is stable this time. Prime95 and Memtest kept freezing at 1.36V and lower. Memtest only passed 100% when it was set to Auto. I guess I'll have to try 1.4V. I'm just a little apprehensive because I can't seem to find an upper limit threshold for the P45 voltage anywhere. The CPU like you said peaks at 1.365 and Corsair told me anything under 2.2V is fine...although I have read of testers running it stable and overclocked at 2.3V. Thanks again. Even if I can't get this thing to run at 3.4GHz your help has already improved memory performance by over 200MB/s in Memtest and my latency benchmark dropped by over 10ns in Everest.

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    If Memtest is failing then you need to work on your ram/MCH, I say that because I am not sure if you meant 1.36 CPU voltage fails Memtest.

    I say this because your CPU voltage should have NO effect on Memtest

    What you actually should do is take the ram out of the picture for now until you find your stable point you want for your CPU. Then later work on the ram. This way when you have error you will KNOW for sure it is the CPU and not the ram.

    To do that set all subtimings on AUTO and then set MAIN ram timings on 666-18

    You can also take your CPU out of the equation if you would like to work the other way around.

    To do that set your CPU to it's lowest or a lower Mutli and then set your FSB to the equivalent that you need to be able to select a memory multiplier you want to run your ram speed at. Such as 6X533 using 1:1 mutli for 1066 Ram Freq, or 7X450 Using the 2.4 Multi for 1080 Ram Freq. Along those lines if you get what I mean, which I think you would

    Anything 2.2 and above you should have a fan directly on the ram, and the users you mention likely do. 2.2 is about the max normal upper limit for DDR2. 2.3 is usable as is 2.4 and 2.5 but anything after 2.2 and your memory's lifetime shortens quickly with a fan or not

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    Default Re: EP45-DSR3 MCH Voltage with Corsair Memory

    I don't intend to bump my RAM voltage above what it is right now...2.13V. As for the 1.36V...that was for the MCH voltage, not the CPU. My CPU right now is showing 1.23V in Windows (CPU-Z and HW Monitor) and 1.25V when entering the BIOS. I believe my issue lies with the MCH Voltage. Like you mentioned earlier, I may try a manual setting of 1.4V and see if that fixes things. Then if I get a pass on Memtest, I'll try bumping the CPU to 425 x 8 (along with a little voltage increase as well) and see if it is stable then. My only concern is the voltage limit on the P45. I hear of people going above 1.5V on other chipsets but can't find information on mine.

    Also, what is your recommended setting for "robust graphics booster?" I'm running an XFX GeForce 8800GT
    Last edited by mikeynavy1976; 08-09-2008 at 12:34 AM.

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