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Why is my i7 860 OC different than yours

post #1 of 35
Thread Starter 
Hello all, this is my first OC and first post on this forum!

I am currently having a ball OC'ing my i7 860, and am trying to get 3.9ghz stable in Prime95 right now.

Only thing I notice is some people on this site have really low Vcore compared to me and are claiming to be stable, but mine is up around 1.37 to 1.38 with temps maxing around 80deg C.

So I guess what I'm asking is it really possible that my chip could require so much more voltage than yours? I also have wall power without a UPS filtering it, and a PSU that maybe near its limit (600w OCZ stealth extreme).

I did also notice though that my IMC voltage is generally lower than others. I tested a bclk of 200 with 1.275 and it was nice and stable.

But what's the deal with Vcore?
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Darlin'
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post #2 of 35
While there are common voltages, all chips are not equal.

All CPUs require different voltages and are capable of different overclocks.

Even the type of motherboard, the power supply and cooling systems can affect this before getting into differences between chip quality.

If you post your settings however, there may be some things in your overclock that could be causing you to require a larger Vcore.

Unclock frequency and QPI link speed are common clocks that cause people instability.
    
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post #3 of 35
LLC could also be a problem. Some people forget to include whether their vcore is with LLC on or off.
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post #4 of 35
Are you using Load Level Calibration, i.e. LLC? If not, your actual Prime95 load voltage is somewhat lower. But then again you might already know this...(edit: beaten to the punch, arg!)

With my i7 860 I get a stable 3.8Ghz at about 1.28v under load. Once past 3.8Ghz I have to disable HT for it sends temps out of control; 4Ghz it takes about 1.36v. As mentioned filling in your computer details and providing bios settings greatly enhances the quality of the feedback.
post #5 of 35
Thread Starter 
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
Darlin'
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post #6 of 35
Try an odd multiplier, its moer stable for some people.

I'm at 20x200 stabled 1.270 load, 1.325 in bios.
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post #7 of 35
On the 1156 boards you might want 1.9 or 2.0 for PLL.

Try backing off your OC for 24/7 use if it's hitting 90C. You won't need more than 3.4ghz/no HT for games.

What's your RAM at? Filling in your specs will help a lot. Go into "UserCP" and input your systems info.
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post #8 of 35
Thread Starter 
that reminds me that HT is on....only reason is that my server modding network admin buddy will mock me
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post #9 of 35
i7 -870
*4.2Ghz
*1.392v
*175 x 24
*75c max prime95
*h50 cooler
    
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post #10 of 35
Thread Starter 
Xristo do you have hyper threading off? or on

I am still blown away by others having a vcore in high 1.2's and a 4ghz OC?!?
Darlin'
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