E6550 overclock freezing problem.

Hey guys.
I've overclocked my E6550 2.33Ghz @ 3.2Ghz w/ Zalman 9700LED which i think it's a really good cooler and also doing a great job right now.
i keep having problem w/ freezing which i dont understand. i know when it freezes, it means tht my overclock is not stable. But I can't find a reason why it keeps freezing. I ran OCCT for about 3 hrs earlier and it froze again.
Here are some things that i thought it could be a reason.

1. Temperature
2. Core Voltage
3. Ram

first of all, my temp is around 30' when it's idle and around 60' when im running Intel Burn Test or OCCT. is tht bad? i thought 60' on full-load is fine.
secondly, my core voltage is 1.36~1.38v. it stays changes around tht range constantly. i think it's enough. is it too much or should i give some more voltage to it?
lastly, i have 2*1GB Crucial Ballistix timed at 4-4-4-12 w/ auto voltage(around 1.8v). I ran memtest and didnt find any error. do u think i tightend the timing to much? should i loosen it to like 5-5-5-15? or like 5-5-5-18?

Please help. Thank you.

oh, and also, would changing my E6550 to E8400 be a big upgrade?
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More about e6550 overclock freezing problem
  1. Just because your temps are low, it doesn't mean its stable. If your freezing after an OC, but not if you take the clocks down, its not a stable OC.
  2. Start in small steps.

    First, make sure your memory is running at its rated voltage. Post a link to the exact memory to let us see, or just use CPU-Z's SPD tab to see the settings/voltage the memory should run at.

    As for the CPU, Voltage depends on the CPU, my Q6600 2 cores need a fair bit more voltage to overclock(I wish i had just the first 2 on there own chip, they clock great). So lower the clocks and slowly increase when it gets unstable, add a bit of voltage. Prime95 is a good way to test with small FFTs (blend is good to test memory/cpu)as it tends to error before out right crashing.

    Your temps are fine, but its clearly unstable so you still have work to do.
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