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Thread: Q6600 and EP45 UD3P mild overclock problem




  1. #31
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    Taken from Lsdmeasap's guide:

    • ACT to ACT Delay (tRRD)________ 3-4
    • Rank Write to READ Delay (tWTR)_______ (4-6) 9-11 (Note Actual Value set in BIOS Vs. What system Uses will be 7+)
    • Write to Precharge Delay (tWR)________ 3-5 (Note Actual Value set in BIOS Vs. What system Uses will be 5+)
    • Refresh to ACT Delay (tRFC)___________ 38-42 (2X1GB) 52-62+ (2x2GB)
    • Read to Precharge Delay (tRTP)_________ 3-6 (Note Actual Value set in BIOS Vs. What system Uses will be 2+)
    • Static tRead Value (tRD)______________ (5/6) 7-10 (800Mhz) 7-12 (1066Mhz)
    • Static tRead Phase Adjust________ 1-31*


    The full version is here: http://forums.tweaktown.com/f69/memo...vs-bios-27283/
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  2. #32
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    FINALLY!! My last post I was in despair so I went and reread everything on the forum could find relating to my problem. Also the Mushkin forum. The one thing I hadn't done was test the sticks seperately or the slots. ( the 4 sticks of Corsair 1gb PC2 6400 ran fine...as did the Mushkin 2x2gb as long as it was underclocked to 800) At least...that's my excuse.

    So this morning I tried the sticks of Mushkin seperately in channel 1. No go at 1066 in MemTest86 for either stick.

    I had been reading somewhere that the 2nd and 4th slot were often different and somehow not as good as 1 and 3 so I almost didn't try them. Having tried everything else, though, I gave it a shot and....eureka! first stick worked! Put in the second stick and still worked with Memtest #5 and #2 so went into Windows and tried Prime 95 Blend. Bummer. Failed after a few minutes. Had seen on the Mushkin forum something about trying a 101 PCI number instead of 100 so I gave it a shot. Got 15 minutes in Prime 95 before an error. Increased the MCH from 1.28 to 1.30 and got 40 minutes and no errors! So I guess I'm on the right track. Though I realize I haven't done remotely close to enough testing.

    On the Mushkin forum, there is repeated reference to raising the MCH voltage for stability and I'm wondering if these xp Ascents just take more MCH voltage than the 996599's. I've seen 1.38 mentioned on the Mushkin forum but never here. Here it's always around 1.24. I'll post some screens later and see what you guys think. Thanks!
    Andy B
    Q6600 GO, 4gb Mushkin XP Ascent PC2-8500, Corsair HX 620, Zalman 9700 cpu cooler, GA-EP45-UD3P

  3. #33
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    This is what I've got now. i tried going to 3.2 but got memory errors so backed off the FSB from 800 to 385. Any suggestions much appreciated. More info to follow. Thanks!
    Andy B
    Q6600 GO, 4gb Mushkin XP Ascent PC2-8500, Corsair HX 620, Zalman 9700 cpu cooler, GA-EP45-UD3P

  4. #34
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    Personally after continuous errors like these, I'd give a 1:1 ratio a go. Either 2.00D or 2.00B.

    I know you would like your RAM to be running at 1066, but the difference between that and 800 is negligable. You'll get nicer looking numbers in a memory bandwidth benchmark, but not much else.

    If you can set 0.5 multipliers try 400*8.5. That will give you 3.4GHz and DDR-800. You may need up to 1.45v Vcore though, so maybe try 400*8 first, then you can always up the FSB at an 8* multi if you are able.
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  5. #35
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    Quote Originally Posted by Psycho101 View Post
    Personally after continuous errors like these, I'd give a 1:1 ratio a go. Either 2.00D or 2.00B.

    I know you would like your RAM to be running at 1066, but the difference between that and 800 is negligable. You'll get nicer looking numbers in a memory bandwidth benchmark, but not much else.

    If you can set 0.5 multipliers try 400*8.5. That will give you 3.4GHz and DDR-800. You may need up to 1.45v Vcore though, so maybe try 400*8 first, then you can always up the FSB at an 8* multi if you are able.
    Thanks Psycho. I know you're right but after finally switching the RAM over to slots #2 and 4 and being able to run at 1066 (FINALLY!) I was thinking it might be a simple voltage issue.

    On the Mushkin forum there is repeated reference to running the MCH voltage as high as 1.38 for the 996619's so I was screwing around with that for a while. But running at 800 seems very stable for this RAM. It (the ram) seems to be picky about the memory multiplier you use.

    Another stupid newbie question: on the right hand side of the BIOS it has a list of memory multipliers. If you're using a CPU host frequency of 400 mhz it says to use the D multipliers, right? But you're saying I can use either B or D? Why would B work and what do these really mean? Also should I be setting an MCH freq. latch? I've been leaving it on auto. Thanks for your help.
    Andy B
    Q6600 GO, 4gb Mushkin XP Ascent PC2-8500, Corsair HX 620, Zalman 9700 cpu cooler, GA-EP45-UD3P

  6. #36
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    It's generally recommended to use the correct multiplier for the current FSB. The 2.00B is for a latch of 333 and usually is recommended for a FSB of 333MHZ. The 2.00D is recommended for a 400MHZ FSB.

    I suggest trying them both as at FSB over 400 MHz, the 2.00D multiplier is still recommended, however it's designed for a FSB of 400, which is no longer the case if you set a value above it. 2.00B has a chance of working, and may work better. 2.00D may work better. It can be a case of try them both and see.

    Personally until recently I could only get stable using 2.00B, but since changing reference voltage and MCH voltage I am now stable on 2.00D with tighter timings.

    Leaving the MCH frequency latch on auto is fine. this setting just lets you change the memory multiplier to any of the settings available. Id you have it on Auto with a 2.00D multi for example the board will be setting a 400 latch. If you have it on 2.00B it will be setting a 333 latch etc.
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  7. #37
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    Quote Originally Posted by Psycho101 View Post
    It's generally recommended to use the correct multiplier for the current FSB. The 2.00B is for a latch of 333 and usually is recommended for a FSB of 333MHZ. The 2.00D is recommended for a 400MHZ FSB.

    I suggest trying them both as at FSB over 400 MHz, the 2.00D multiplier is still recommended, however it's designed for a FSB of 400, which is no longer the case if you set a value above it. 2.00B has a chance of working, and may work better. 2.00D may work better. It can be a case of try them both and see.

    Personally until recently I could only get stable using 2.00B, but since changing reference voltage and MCH voltage I am now stable on 2.00D with tighter timings.

    Leaving the MCH frequency latch on auto is fine. this setting just lets you change the memory multiplier to any of the settings available. Id you have it on Auto with a 2.00D multi for example the board will be setting a 400 latch. If you have it on 2.00B it will be setting a 333 latch etc.
    Great info, Psycho...thanks a lot. I'll let you know how it goes.
    Andy B
    Q6600 GO, 4gb Mushkin XP Ascent PC2-8500, Corsair HX 620, Zalman 9700 cpu cooler, GA-EP45-UD3P

  8. #38
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    Less MCH Core and more Vtt will also likely help alot. For sure less MCH should help before anything else, you should not need 1.3 at all

  9. #39
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    Well I started with MCH of 1.2 and worked my way up. I have the CPU termination (Vtt, right?) .1 under the vCore but I'm very new at this. I'm way open to suggestions. I was able to get stable at 1066 with stock settings on the CPU but I had to switch the Mushkin to channels 2 and 4 to do it and go to 1.3 on the MCH.
    Andy B
    Q6600 GO, 4gb Mushkin XP Ascent PC2-8500, Corsair HX 620, Zalman 9700 cpu cooler, GA-EP45-UD3P

  10. #40
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    Default Re: Q6600 and EP45 UD3P mild overclock problem

    I've been running using the B-memory channel (slots 2 & 4) for the past month with no problems. My mobo doesn't seem to care if I use the A or B memory channels.

    I suspect that your mobo is defective because it won't properly run your memory at its rated speed in the A-channel.
    I had no problem running my cpu at:
    459MHz cpu host frequency
    2.40B System Memory Multiplier, resulting in 1102MHz memory speeds
    2.02 Dram Voltage
    1.26 MCH Core Voltage

    At 457MHz, the MCH voltage was stable with 1.24 volts.
    I've been using 1.26 MCH voltage with my system running in the low to mid 490MHz range.

    It wouldn't surprise me if your Mushkins and mine have identcial chips, with the only difference being the high tech heat spreaders on your memory.

    My 996599 memory runs cool to the touch even when running IBT or other stress tests. My infrared thermometer confirms the cool temperatures.

    The wider Ascent modules won't be able to run with 4 modules in our Gigabyte boards due to the wider width of the memory's heat-sinks.
    Mushkin states: "NOTE: for 4 module installation, please ensure your motherboard has slot spacing of 2mm or greater."

    The higher MCH voltage settings are usually only necessary when running more than 4GB of memory or if your trying to overclock your memory well beyond 1100MHz speeds.
    Mushkin_Greg posted his 1200MHz memory settings using about 1.34 MCH voltage in a high end Asus board.
    I'd love to test this out running my system at 6 x 600MHz, memory at a 1:1 ratio, but my cpu won't post above 528MHz no matter what settings I try.

    My system is significantly faster running with a 1:1 memory ratio (2.00D system memory multiplier) at 494 (versus 459) speeds.
    Last edited by profJim; 05-20-2009 at 04:12 PM.
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