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Why is my i7 860 OC different than yours - Page 2

post #11 of 35
It's obviously not the same to compare the 8x0's to the 9x0's, but my 920 easily reached 4.0GHz on 1.25 Vcore. Large differences in capabilities, I guess...
post #12 of 35
Sorry to derail, but can some Intel guru tell me if 1156 worth buying now, or is 1366 more worthwhile. No SB
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post #13 of 35
Depends if you need SLI and if you would benefit from triple channel memory. They seem to overclock to about the same (4.0 ghz for most people, 4.2 within reach of a lot of people and anything beyond is hard on air).
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post #14 of 35
Quote:
Originally Posted by mattnum;12004071 
Hi Guys thanks for the replies!

I have LLC enabled. The funny thing about my high volts is that I feel safe with temperatures so far, it does hit 90 with Prime95 small FFT or whatever. But I only play games, so as long as it's stable I won't push a temperature like that at all.

The rest of my info is:

bclk 181x22 cpu
Vcore 1.38125 (which will have to come up as it failed prime but past LinX)
DRAM freq is just low so it's not bothering anything (1086 or something)
QPI Freq auto
IMC 1.275 (made 200 bclk stable when I was just testing the mobo out)
DRAM volt auto
CPU PLL tried both 1.8 and 1.9 with no change
PCH auto
LLC enabled
CPU Spread Spectrum Disabled
C-State tech disabled
Speedstep disabled

600w psu
Asus P7p55D pro mobo

Ok cool, I think I can see your issues:

First as already mentioned, try using an odd multiplier, 191 x 21 is one of the most commonly stable combinations.

Increasing your PLL shouldn't make a difference, from what I've read either undervolt or leave it.

Your QPI frequency should be set to the lowest numerical value, I cannot impress on you how much of a difference this makes.

On top of that your Uncore frequency should be set to 2x your RAM speed, maybe a tiny bit more once you're stable.

Leave your V-core where is it too for now, I expect you will be stable after you reduce your QPI and Uncore, the odd multiplier should help too. You might find you can decrease your voltage significantly.

Tell us how it goes.

Edit:
Leave HT on for now imo, you paid for an i7 not an i5 lol.
Edited by Crabid - 1/14/11 at 4:53am
    
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post #15 of 35
@TickleMeElmo, what's your max temps you be getting on prime95 with your i7 860 @ 4.2 Ghz with HT on and off.
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post #16 of 35
Thread Starter 
Awesome thanks Crabid. I will try upping the QPI to the minimum numerical value, not knowing if it will add to instability I am going to back off the cpu but keep Vcore up to make sure the QPI doesn't mess with anything.

I am a little unclear on the difference between uncore and QPI....and IMC, unless IMC is only dealing with RAM?

I also cannot find uncore in my BIOS.

I have:
BCLK freq
PCIE freq
DRAM freq
QPI freq

Thanks again,

Matt
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post #17 of 35
altough i do not have a similar chip, my i5 760 needed 1.3 VTT to get stable for 4.0 ghz. i know it doesnt make sense but it didnt matter if i changed my vcore all the way up to 1.45, it just didnt get stable without the VTT. im not sure if this can help you but i thought i share my thoughts wink.gif

Edit: QPI is i think the speed between ur chip and the southbridge(anyone confirm? tongue.gif). IMC is the internal memory controller(thingy that controls ur ram) the voltage of ur IMC is also known as VTT. i never understood Uncore though.
make sure u have ur PCIE freq set to 100, overclocking it makes it instable really fast. i have been tought to set qpi to lowest as possible(dunno if it is best to do though) and Dram to what ur ram can take. u might want to loosen ram timings and set frequency to low till u got ur cpu stabalized.
Edited by punceh - 1/14/11 at 6:07am
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post #18 of 35
i needed like 1.35v for 4ghz and can do 4.2ghz on 1.4v but alll chips are different, you might have just goten a crappy oc'er.. also get better cooling 83*c is the most you will want to hit on that chip
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post #19 of 35
Thread Starter 
Thanks guys...OCing is starting to make less and less sense. I thought Vcore would always be the key for CPU OC, but at these higher clocks it seems as though a combination of things will stabilize...I just don't see the logic.

As per Crabid's suggestions I have put QPI to the lowest (bclk 191) which is 6118mhz.

I also boosted IMC voltage from 1.275 (which I stabilized a bclk of 200 with while the cpu multi was set really low)

DRAM I set to 1.65 even though my ram is running slow

PCH to 1.15
PLL to 1.90

DRAM, PCH, and PLL had all been auto before but now the system is a little bit more stable ( passed a short run of LinX) Vcore was 1.8 or so (191x21). Sadly I just tried reducing Vcore to 1.368 and it failed LinX in 11s! Oh geez.


I need to head to work. I'll try again tonight.

Matt
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post #20 of 35
Quote:
Originally Posted by AWESOME_3_SOME;12006814 
@TickleMeElmo, what's your max temps you be getting on prime95 with your i7 860 @ 4.2 Ghz with HT on and off.

I was hitting high 80s with a 30 degree ambient, its really hot here right now so I backed it down to 4.0 until the weather cools down a little and i'm hitting highs of about 77 in P95 with 31 degree ambients. (HT off in both instances)
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