Ram preventing CPU overclock?

I have a Q6600 that i have never been able to get a stable overclock on until today. I'm on an EVGA 750i sli mobo. My ram is ddr-2 667. The only way i've gotten a stable overclock is to set the ram to sync and overclock my cpu to 2.8 and that leaves my ram at 624. If i leave my ram unlinked and keep it at stock speed my overclock will be unstable and my computer will restart randomly. But with it synced i can run OCCT for an hour without any problems. Would upgrading to ddr-2 1066 allow me to achieve a much higher overclock?
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  1. :hello: Slim. Welcome to the forums.

    DDR2-667 RAM's native speed is 333 MHz. That means you should be able to run at 3.0 GHz without exceeding your RAM's limits.

    Set your FSB clock to 1333 MHz (333 MHz FSB freq), RAM to Linked, and increase your CPU voltage a little. And you should be able to run at 3.0 GHz.

    On my eVGA motherboard, that didn't work. I had to set the memory to Unlinked and manually input memory clock settings. I always run my Core2 boards at 1:1.

    You should be able to stretch your RAM to DDR2-733 speeds (367 FSB freq). That will take you to 3.33 GHz. You set the RAM voltage to 2.2 volts. That is a safe voltage for DDR2 chips. Then you relax the memory timing from 4-4-4-12 to 5-5-5-15 or 5's-15 to 6's-18. Leave the command rate at 2T. You will lose a little memory i/o speed (about 3%), but that will have no measureable impact on system performance.

    The upper limit of a G0 Q6600 is from about 3.4 - 3.6 Ghz. Anything faster than DDR2-800 is a waste of money. Besides, most DDR2-1066 RAM is really DDR2-800 RAM that has been tested to run at the higher frequency with relaxed timings and higher voltage. And that, you can do yourself.
  2. jsc said:
    :hello: Slim. Welcome to the forums.

    DDR2-667 RAM's native speed is 333 MHz. That means you should be able to run at 3.0 GHz without exceeding your RAM's limits.

    Set your FSB clock to 1333 MHz (333 MHz FSB freq), RAM to Linked, and increase your CPU voltage a little. And you should be able to run at 3.0 GHz.

    On my eVGA motherboard, that didn't work. I had to set the memory to Unlinked and manually input memory clock settings. I always run my Core2 boards at 1:1.

    You should be able to stretch your RAM to DDR2-733 speeds (367 FSB freq). That will take you to 3.33 GHz. You set the RAM voltage to 2.2 volts. That is a safe voltage for DDR2 chips. Then you relax the memory timing from 4-4-4-12 to 5-5-5-15 or 5's-15 to 6's-18. Leave the command rate at 2T. You will lose a little memory i/o speed (about 3%), but that will have no measureable impact on system performance.

    The upper limit of a G0 Q6600 is from about 3.4 - 3.6 Ghz. Anything faster than DDR2-800 is a waste of money. Besides, most DDR2-1066 RAM is really DDR2-800 RAM that has been tested to run at the higher frequency with relaxed timings and higher voltage. And that, you can do yourself.


    Thank You for welcoming me to the forums and for your help

    Moving to 1333 FSB i tried having my ram linked and unlinked and i get a blue screen just as it boots into windows. I know that voltage to my cpu isn't the problem as i have tried moving it up. I run 2.8 ghz at 1.35 volts and i adjusted my the voltage all the way up to 1.45 to try and get a stable 3.0 overclock with the same result of the blue screen upon booting into windows. The only thing i can think of is that my ram is so crappy that it can't even handle the cpu being clocked that high. I even tried loosening the timing to 6-6-6-18 and couldn't get a stable 3.0 overclock. Then i decided to give my ram a jump from 1.9 to 2.0 volts and that didn't do the trick either. I think i need to purchase some good ddr-2 800 ram, I'm not sure what else the problem could be. Trying to get as high an overclock as i can before Christmas gets here and i receive my 560 GTX Ti
  3. You dont need that high voltage, at 1.25v, you should be able to get around 3.3GHz... Raise your memory timing to 7-7-7-20 and see if it's stable...
    RAM Overclocking involve in timing, speed, DRAM Voltage and Northbridge voltage...
    If you can OC your RAM than dont bother with it, jsut OC your CPU and lower the multi on RAM. Not sure how those old LGA 775 works but i think you can select the RAM speed such as 1066 and 1333 and 1600, lower it down to 1066 and OC cpu so the RAM hit 1333 than stop...
  4. Thanks for all the help, but i found a solution to my problem. I set my ram to 2T instead of 1T and haven't had an issue yet. I'm at 3.4 ghz and no problems running OCCT.
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