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Thread: need some RAM OCing tips

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    Default need some RAM OCing tips

    Hello all, this is my second thread here on the forums. The last one was very helpful indeed on getting my cpu overclocked (Need some overclocking tips ) but now i want to oc my ram as well but hit a few brick walls.

    My mobo came with corsair value select 667Mhz sticks and they seemed to run fine but i thought i could get more performance from a nicer set. So i upgraded to Corsair Dominator series PC2-8500 wich should be capabill of running at 1066Mhz. Right now i can only get it to run at 566Mhz. Also at this speed it showed errors after about a 2 hour test in orthos. Its voltage is running at 2.2V which it is rated at and i have the timings at 4, 4, 4, 12, 16. My frontside bus is at 971Mhz (242) giving my cpu clock speed a 4.1Ghz rating (stock speed is 3.4Ghz, 800FS i was never able to reach a 1:1 ratio with the ram at 533. and as it sits i cant get much more speed out of them anyway unless i am doing something wrong or out of order, considering going back to the value select if i cant get the speed out of the dominators.

    i was also considering lowering my ram to a 485Mhz (242.5) setting to see if i can get a 1:1 ratio that way but that just seems like im downgrading. But if i cant get more speed out of it maybe that would be best and just focus on my timings. Only thing is though i dont know much of the math involved when it comes to the timings so i dont know if i am getting more speed out of them that way or not. So could someone please help guide me though this somewhat so i can get the maximum stabil speed out of my rig?
    Last edited by Jameson; 02-05-2007 at 06:19.

  2. #2
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    can you post a cpu-z screenie for both cpu and memory, you should be getting far higher so i can only imagine you are using the wrong divider to make the best of the dominators.

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    it is getting quite late here for me now, so i am going to head to bed...the sun is coming up :P but i will be all excited to check for replies when i get up

  4. #4
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    you can't lower the multiplier on a Pentium D can you? I'm by no means well versed in P4 overclocking, but as far as i know, it's never a good idea to get the higher models because you'll hit a wall very early on, you've only got to 240MHz FSB and already you're hitting the limit of the CPU or air.

    To solve this, you'll need to go for a higher memory divider, so taking your FSB as an example, try 1/2 divider (or it might be 800 MHz memory option in BIOS). this way you will get: 240x2=480 (960MHz), which is much better than you are currently getting.

    If you have a list of dividers in the BIOS, post them up, i can help you choose the best one to get as close to 1066 MHz as possible, but it's possible you won't have one that fits the bill, and even if you do, some of them aren't always as stable as the most commonly used ones (normally 2/3, 1/2 etc).

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    Default

    unfortunatly not on my pentium...only on the extreme version can you unlock the multi. to get the divider down to a 1/2 i would have to lower the fsb or raise the ram Mhz to achieve this...i think i was running at that with the stock setings....the only adustments i have in bios for my ram is just the Mhz freq., the timings, the link/unlink option, and the voltage as well. If i dont have the divider options in my bios then am i stuck to just adjusting my timings?

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    what mhz freq options do you have then?

  7. #7
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    Default

    my mem speed frequencies can be adjusted in 1Mhz increments from 400Mhz to 1300Mhz (200 to 650)

  8. #8
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    that isn't a memory setting, thats the FSB frequency.

    somewhere in your bios you should be able to choose the memory frequency (533, 667, 800 etc) or have a choice of memory dividers (1:1 1:2, 2:3 etc. have a look for something like this.

  9. #9
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    in my bios i have a frequency setting for my fsb that ranges from 400 to 1300 Mhz and my ram has a separate setting that works exactly the same. I can choose to link them or go with the expert setting witch lets me adjust them independantly. I do have turbo modes for each as well (not really sure what they do though). The following screen shot is from a review of my board so the setting do not reflect what i have them at but it shows what i have to work with.

    nowhere else do i have any adjustments for my ram or fsb....including dividers or frequencies. Has anyone ever experimented with custom bios or anything of that nature to open up extra options such as the ones you have mentioned?

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    never seen anything like this in my years, but it should work the same, if not even more flexible than traditional dividers.

    Do you mind chacking a few bits for me?

    Try 800 FSB, 800 mem, then go into windows and takes some screenies like you did before of cpu-z (the last one isn't needed, just the first two).

    Then try 960 fsb and 800 mem, and do that same. I just want to see what happens, it should explain quite a bit (hopefully).

  11. #11
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    Default

    thatwas the first thing i did when i installed my ram....i set it to run at 800Mhz to match my800Mhz FSB...but it wouldnt post. I would assume that i would not get any luck if i uped the FSB beyond that. Also if i cant post i need to clear the CMOS and redo all the settings all over again (real pain). It is getting real late here so i think i am gonna have to do this tommorrow (thurs.) so i am sorry if you are anticipating a real reply tonight. But you did get some info (800FSB+800MEM= no post)

  12. #12
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    Default

    well i did succeed in getting a 1:1 ratio by lowering my ram speed to a 480Mhz speed/960FSB. I tryed to get the ram at 800 but once again, no post. and when i cleared CMOS it auto set itself back to 533.3Mhz. That gives me a 3:4 ratio at stock FSB speeds. the first two screenies are from before i cleared CMOS with the lowered ram speed to achieve the 1:1 ratio.


    the second set is from after i cleared CMOS leaving everything at the default settings



    i am thinking that maybe i went too big with the ram....maybe i shoulda just stuck to 800Mhz sticks instead, but i was trying to turn a gremlin into a funnycar it seems . considering reinstalling the old Corsair VS 667Mhz ram tonight after work, i am pretty sure they ran at 667 without a problem. But if i do achieve a 1:1 ratio then that should mean than my ram and cpu are running at the same speed, isnt this ideal? How can speeding up the Mhz actually give more system speed if the ram is waiting for the cpu to catch up?:confused:

  13. #13
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    i dont have any screenies yet but i have achieved a 660Mhz (330) memory clock, (even though cpu-Z says it's 666.8Mhz) with 3, 3, 3, 11, 14 and hitting high 31s in super pi. Survived a 7 Hr orthos stress test. does this sound like a good thing?? all i know is that iu am improving on my super pi scores but it is starting to get in much smaller increments.

    does anyone know how the last 2 settings for the ram timings relate to the first 3 settings?
    Last edited by Necro1; 05-05-2007 at 06:11.

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