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Intel Core i7 870 OC questions

post #1 of 64
Thread Starter 
Hey guys!

I have a few questions about overclocking.

Firstly, I just read it on some topic, is it true that it doesn't matter how much is your CPU Core voltage - you can put it to 2V and if you don't overheat - you're not doing any damage on the CPU by running extreme voltages? Because what I've known by now is never go above XX Voltages.

Second Q) Bclock vs Multiplier. How is it better to overclock? With max multiplier or more Bclock? For example which is best - 24x167 / 22x183 or 20x200? Which would hit lowest temps/voltage?

Third Q) As I can't find many users around here that have 870/860 and have posted their OCs I want to ask. For a Lynnfield, going to 4GHz on 1,31V with HT off is good or bad? I mean, is the chip good or bad?

Fourth Question is.. Ugh.. I said I hit 4GHz, but.. I don't anymore. I mean, I had a H60 cooler but as I was leaving the case open my cat has eaten one of the tubes and it has leaked. So I don't have water cooling anymore. So my question is.. Now I have to buy a new cooler. Is a H100i going to be worth? I mean, is it going to have a difference that I'll be able to feel or it's going to be 1-2C? In the shop from where I buy the stuff I can choose from H100i, H80 and H60 (80 and 60 - both aren't i but the old ones).


Thanks for your help in advance! smile.gif
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post #2 of 64
Thread Starter 
Anyone? frown.gif
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post #3 of 64
Extreme voltages can hurt the cpu. It will likely shut itself down form the temps fairly fast, but too much voltage is definitely not good for it. Subzero cooling will help slow down electromigration at higher voltages, for air & water cooling. don't go nuts with the vcore.
Multiplier is easiest to get the frequency up, bclk also works but have to watch the memory frequency, hard to say which of those settings will be best for your hardware, you'll have to test & see.

I haven't used an 1156 rig so can't be too helpful, although the multi & bclk work similar to x58 which I've used.
    
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post #4 of 64
Most lynnfields like 200x20 because it keeps your ram an even multiplier and helps keep your ram stable at the same time. I have to run 1.38 to get 4.0 stable but my temps are fine and Im under the 1.4v max rec by intel. Lynnfields seem to like a high vtt for instance mine is 1.30 and stock is like 1.1. Quite a jump. Without ht your the same as my 760 so theres really no point in turning it off. Make sure speedstep, c1e and cstates are all disabled. It will mess with your oc a bit.
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post #5 of 64
I would just set your bclk at 200 and work your multi from there. Anything over 200 is difficult with lynnfield :\
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post #6 of 64
Thread Starter 
Umm.. Just tested. Maximum Bclk I can reach is 220. (possibly 222 - need to further test to confirm). Now for the SpeedStep. Why should I disable it? I've always kept it Enabled? Doesn't it just lower your multiplier and VCore when not needed so your CPU can cool down? I thought that's really helpful.

And another thing that just came to my mind. What else do I need to change beside the VCore,Multiplier,Bclk? And just lowering RAM frequency due to bclk? What else would I be able to do for more stable system or further overclock or just necessary to do?

And Thanks for your help guys! smile.gif
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post #7 of 64
There is no way you were stable at 222. Not without water and LOTS of voltage.
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post #8 of 64
Thread Starter 
No, no I just tested how far my bclk can reach. I was on x9 multiplier. biggrin.gif
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post #9 of 64
Try 200x18 w 1.3vcore, vdroop off, cstate off, speedstep off, and c1e disable. Leave HT on though. Set vtt to 1.25. Your ram should default to rated speed and timings but being hyper x you should be able to run 1600. Its probably 1.5v ram?
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post #10 of 64
Thread Starter 
Will be able to try in a few days. I'm just gathering information till I get the new cooler. smile.gif Thanks! smile.gif
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Intel(R) Core(TM) i7 CPU 870 2,93GHz ASUS P7P55D nVIDIA GTX 670 Palit Jetstream 2GB 2x2GB DDR3 Kingston Hyper X 1333MHz 
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