Core 2 Duo e6750 + 680i lt overclock limiting factor?

I recently rebuilt my computer from a:

CM Centurion 5 case
E6750 (running at 2.8 Ghz, vcore=1.35)
Intel cooler
680i lt MB (Auto voltage)
4 x 1 GB Crucial Ballistix DDR2
<>Factory: DDR2 1066, 5-5-5-15, 2.2v
<>Stable: DDR2 700, 4-4-4-12, 1.85v


Antec 300 case
E6750 (running at 3.1 Ghz, vcore=1.35)
Sunbeam Core Contact Cooler
680i lt MB (Auto voltage)
4 x 1 GB Crucial Ballistix DDR2
<>Stable: DDR2 775, 4-4-4-10, 1.85v

I attempted to further incrementally increase the overclock today without success with the following:

CPU: (3.2 Ghz, vcore=1.375)
FSB: 400
Ram: DDR2 800, 4-4-4-8, 2.0v

With 3.2 Ghz being my target, due to the 680i lt MB having a max ram speed of 800 Mhz, I would like suggestions on what should try to get to my target. Of note, however, is that I do not want to increase the voltage on any components "too high" due to component burnout. (This especially applies to the FSB, as the 680i lt series is actively cooled, and always runs very warm.)

I am using Prime 95 for stability testing. Further, with the 3.1 Ghz current speed, Speedfan reported a max temp of 55c. (However, it usually ran ~50c.)

Thank you in advance.
4 answers Last reply
More about core e6750 680i overclock limiting factor
  1. Your not over volting your vcore, well within specs for your Ram, got GOOD cpu temp. You shouldn't have any problem with 3.2 Ghz on a E6750.

    The only thing I can see (of what you have posted) is I'm sure your Ram is NOT rated for 4-4-4-8 @ 2.0 Volts. I would change to 4-4-4-12 (15) or even 5-5-5-15 @ 2.2 Volts to rule out a Ram problem. Once you rule it out as a problem you can reduce the voltage and tighten up the timings.
  2. My thought as well, but based upon:

    I assumed the ram should be able to handle 4-4-4-8-2T at 800 with 2.0 volts, since the review successfully ran them at 4-4-4-8-2T at 1066 with 2.35 volts. But, as all know, all chips are different...especially the later revision.

    Will update with new information tonight once home from work and testing proceeds.
  3. 1. Due to the later reviews on my model number of ram (chip burnouts, etc.) and the hassle involved in RMA'ing through Crucial.

    2. The fact that changing my ram to 5-5-5-12-2T at 2.2v allowed me to gain the extra .1 Ghz, but nothing less than that timing would allow the computer to complete Prime95 for longer than 10 minutes.

    3. And, my current "Into" system runs stable with Prime 95 for 24 hours.

    I am going to stop at 3.1 Ghz and 775 Mhz ram with 4-4-4-10-2T. Last step, see if I can reduce my vcore voltage. (Currently testing 1.325.)

    Thanks for the help RJR, but a long life for my system (and less repair) is more important to me than a bit more speed.
  4. I think you have made the correct call on this one, take care.
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