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i7 860 overclock - Page 2

post #11 of 50
Quote:
Originally Posted by l3gend. View Post
thanks for "digging on the subject" much appreciated bobfig

so you set your IMC to auto? PLL and PCH also to auto?

according to my bios any setting over 1.21v VTT is "high" because the text changes to a reddish/purplish colour...
originally yes but i did change a couple. the PLL i have came across say that sometimes lowering your PLL a little would help the over clock to be stable. mine was originally at 1.8v and now is set to where u see it is now. as for the PCH that i haven't touched so i assume it is.

so fare on the IMC i came across some threads that say that with a over clock as high as 4ghz and ram at 1600mhz it isn't uncommon to to see around 1.35v and maxes are around 1.4ish daily.
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post #12 of 50
Thread Starter 
Quote:
Originally Posted by Voltage_Drop View Post
It depends on your temps. If you are below TJmax then I would bump up the Vcore and VTT, if your temps are getting to high then you should lower Voltage and set the BCLK where it is stable.
bump up both VTT and vcore? i thought it would be one or the other's fault thats causing prime95 to error

also ive found a post from another forum:
Start by lowering your CPU multi to x16...that way we can keep the CPU out of the picture for a few minutes. To ensure consistency, disable all power saving and throttling features, and set your vcore to 1.25V and enable load line calibration.

Next, back your memory way down to the lowest multi, leave the timings at CL9 how they are now, that should be fine. Lock your vDIMM at 1.65V and your VTT to 1.35V.

Also, change all other BIOS voltages/timings back to "auto".

Now, we are ready to find your basic Bclock limit. Start pushing it up from 180MHz in 5MHz increments with a 5 min stability test each time. If you make it to 210MHz, then drop back to 200MHz and see if the stability test will pass for 30 min. If you cannot make it to 210MHz, try to give it another bump in VTT, to 1.4V or so, and try again.

If you get your Bclock stable at 200MHz with these loose mem timings, the next step is to tighten them up. So raise your mem multi back up (one step at a time) to where you want it...checking for basic (5 min) stability at each step. Although for now, do not exceed the manufactures specs for the memory speed/timings. If you find an instability, raise the VTT a little.

After getting your Bclock and memory stable, we can go back to working on your CPU. VTT & vDIMM are the only voltages we should have played with much so far, because we now have a stable Bclock & mem settings, we can freely OC the CPU and our only variables will be CPU voltage, and heat.

OCing is all about controlling your environment, isolating one component at a time, and pushing each piece to it's limit.

it recommends me to raise my VTT to 1.35v which is extremely high~! and possibly increasing it some more!

but i dont understand why i need to check for bclk stability before adding on the multiplier??
post #13 of 50
Thread Starter 
Quote:
Originally Posted by Voltage_Drop View Post
Id start at 1.3VCore/1.27VTT and then see how high you can get the BCLK with the multi at its max. You can always lower the multi but then you will need a higher voltage to sustain the higher BCLK as well. You are also going to have to watch your RAM and set the multi(SPD) to keep it within reason until you know the limitations of your RAM. RAM timings are also important as well. Usually you must loosen its timings if you raise its frequency.
this seems like a reasonable approach better than the previous suggestion i posted..

also i suppose that intel turbo boost is disabled(x22), same with EIST and C states etc.

what BCLK should i start with?
post #14 of 50
Quote:
Originally Posted by l3gend. View Post
bump up both VTT and vcore? i thought it would be one or the other's fault thats causing prime95 to error

also ive found a post from another forum:
Start by lowering your CPU multi to x16...that way we can keep the CPU out of the picture for a few minutes. To ensure consistency, disable all power saving and throttling features, and set your vcore to 1.25V and enable load line calibration.

Next, back your memory way down to the lowest multi, leave the timings at CL9 how they are now, that should be fine. Lock your vDIMM at 1.65V and your VTT to 1.35V.

Also, change all other BIOS voltages/timings back to "auto".

Now, we are ready to find your basic Bclock limit. Start pushing it up from 180MHz in 5MHz increments with a 5 min stability test each time. If you make it to 210MHz, then drop back to 200MHz and see if the stability test will pass for 30 min. If you cannot make it to 210MHz, try to give it another bump in VTT, to 1.4V or so, and try again.

If you get your Bclock stable at 200MHz with these loose mem timings, the next step is to tighten them up. So raise your mem multi back up (one step at a time) to where you want it...checking for basic (5 min) stability at each step. Although for now, do not exceed the manufactures specs for the memory speed/timings. If you find an instability, raise the VTT a little.

After getting your Bclock and memory stable, we can go back to working on your CPU. VTT & vDIMM are the only voltages we should have played with much so far, because we now have a stable Bclock & mem settings, we can freely OC the CPU and our only variables will be CPU voltage, and heat.

OCing is all about controlling your environment, isolating one component at a time, and pushing each piece to it's limit.

it recommends me to raise my VTT to 1.35v which is extremely high~! and possibly increasing it some more!

but i dont understand why i need to check for bclk stability before adding on the multiplier??
I have never done it that way, that just seems like a very timely process to go along with the time involved in just stability testing. I like to keep VTT just a few notches lower than Vcore. So if I raise one, then I raise the other. Usually you should keep Vcore and VTT within .05V-.03V from each other, VTT always being the lowest of the two. there is also another rule of thumb which you must not exceed RAM voltages from .5V from Uncore(VTT) voltage or you burn up your IMC.

Only time I have raised my VTT up to or past 1.35V is for validation purposes only and I do not recommend that you do so for stability testing or benchmarking. NOTEI have never had to go that high on either of my chips, but not every chip is the same)

Quote:
this seems like a reasonable approach better than the previous suggestion i posted..

also i suppose that intel turbo boost is disabled(x22), same with EIST and C states etc.

what BCLK should i start with?
Yes disable turbo boost and if you dont use or need HT then disable to keep the temps down. If you need HT then you are going to have to keep your OC within reason of the temps.

As for BCLK, I always start at 1.3V and then shoot straight for 4GHz and see if I can boot without BSOD, and check my temps immediately! If you are stable then you can either lower the voltages until you become unstable or BSOD and then bring it back up when you could boot or were stable. Or you can shoot for a higher BCLK until you become unstable
Edited by Voltage_Drop - 1/21/11 at 11:05pm
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post #15 of 50
Quote:
Originally Posted by l3gend. View Post
hi shorty smalls,

im interested in what your temps read at idle and at max prime95.

i tried overclocking to 3.8ghz but i cant get it stable even at 1.3v

if i increase it to 1.35v max temps would be in the 90C range.

would you suggest any other settings at lower freq.

thanks.
right now with 4.2 1.45vcore its 30*c idle and 62*c load.. but thats with a $400 wc loop, back with the ol aircooler simular to what u have it was like 40*c idle 85*c load at only 1.4v and 4ghz
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post #16 of 50
just want to note that i have been lowering my IMC voltage from 1.365v to 1.325v and it still seems stable. im going to keep going and find where my limit is. will report later on my findings.
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post #17 of 50
Thread Starter 
1.3VCore/1.27VTT - will try 4.0ghz but 90% it wont boot

- keep Vcore and VTT 0.03-0.05v from each other
- keep VTT and vDimms 0.5v max apart

first one check.
second one 1.27v VTT and 1.6v vDimm check.

will post progress...thanks again voltage drop
post #18 of 50
Thread Starter 
Quote:
Originally Posted by bobfig View Post
just want to note that i have been lowering my IMC voltage from 1.365v to 1.325v and it still seems stable. im going to keep going and find where my limit is. will report later on my findings.
thanks bobfig, 1.365v does seem quite high for 24/7 use. i wouldn't risk over 1.35v or maybe that is just me..
post #19 of 50
Quote:
Originally Posted by l3gend. View Post
1.3VCore/1.27VTT - will try 4.0ghz but 90% it wont boot

- keep Vcore and VTT 0.03-0.05v from each other
- keep VTT and vDimms 0.5v max apart

first one check.
second one 1.27v VTT and 1.6v vDimm check.

will post progress...thanks again voltage drop
You are welcome and nice summary of everything I said If you cant boot at those voltages then:

1. You need to fine tune your RAM
2. After you have ruled out the RAM then it is most likely that you need a higher Voltage to maintain stability.
3. Keep an eye on your temps, I can not stress that enough.
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post #20 of 50
Thread Starter 
Quote:
Originally Posted by Voltage_Drop View Post
You are welcome and nice summary of everything I said If you cant boot at those voltages then:

1. You need to fine tune your RAM
2. After you have ruled out the RAM then it is most likely that you need a higher Voltage to maintain stability.
3. Keep an eye on your temps, I can not stress that enough.
well according to my first post tjunction is the max temp but really it should is about 80Cs

is this correct? or should i keep pushing until i am in the 90s during prime95?

(70C is a good load temp but its not achievable with my CM 212+)

thanks.
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