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i3 540 overclock help

post #1 of 9
Thread Starter 
I read a few guides including this one:

http://www.techreaction.net/2010/09/...e-clarkdale/4/

Could anyone give me ballpark voltages to be trying for 4ghz to 4.4ghz?

Does vtt matter as much as 1156?
post #2 of 9
ballpark?....1.25-1.55V
VTT mostly matters if you're pushing high DMI/memory speeds
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post #3 of 9
Thread Starter 
Well, Just started overclocking the the Biostar TH55B. I believe for a 200 blck I would need to set the igpu @ 500?

I've been having a tough time so far. Tried right away for 4ghz, but no luck. Sitting on 3.8ghz right now @ 1.32v. Haven't done any testing yet, but about to.

What vtt would you recommned for 20x200 @ 1600 speeds?

What are the maximum save voltages for 24/7 use?
post #4 of 9
All those questions are answered in my guide.....I thought you read it
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by miahallen View Post
All those questions are answered in my guide.....I thought you read it
I did read your guide. I know how to overclock, I didn't see any information on the maximum saefe vcore recommended? I'm guessing ~1.4v? Maybe I skimmed over it? Awesome guide btw.

Right now I'm at 1.21v, 4ghz (174x23). I think the igpu was messing me up. I couldn't tell at first if the Biostar bios fixed the frequency problem because when I changed the blck the igpu changed as well. They didn't fix it; still have to manually adjust yourself.
post #6 of 9
I read the same thing:

I do not recommend exceeding 1.4V.

I'd say that would be the max he would recommend.

EDIT: Great guides btw Miahallen
    
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post #7 of 9
Quote:
Originally Posted by cory1234 View Post
Right now I'm at 1.21v, 4ghz (174x23).
That's impressive. Nice chip.
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post #8 of 9
Quote:
Originally Posted by cory1234 View Post
Tried right away for 4ghz
That's your problem. These chips have huge voltage and overclockability variances, so it's nearly impossible to give advice until you work your way up slowly and get a baseline for how it likes (or doesn't like) to clock.

3.8ghz at 1.32v is pure insanity unless you've got a chip with a 1.30v VID. Most chips can do 3.6-3.8ghz at stock or near stock voltage. Most need a little more juice for 4.0ghz. Most need a lot more juice for 4.3ghz and above.

I did 3.8ghz at stock voltage, 4.0ghz at like 4-5 ticks over stock voltage, and 4.4ghz at like 30 ticks over stock voltage. I'd say that's on the lower voltage side of average.
Edited by AyeYo - 11/22/10 at 7:09pm
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post #9 of 9
Quote:
Originally Posted by cory1234 View Post
I did read your guide. I know how to overclock, I didn't see any information on the maximum saefe vcore recommended? I'm guessing ~1.4v? Maybe I skimmed over it? Awesome guide btw.
Quote:
Originally Posted by Page #3....right at the top
CPU Vcore – Directly related to the CPU frequency. As you increase the CPU frequency you would need incrementally increase the v-core as well. Everyone continues to ask what is “safeâ€, and I’ll continue my previous suggestion that a safe voltage for you system should be determined by your LOADED CPU core temperatures. So, while you are stress testing, monitor your CPU core temperatures with Real Temp and if the temperature is under control, you can SAFELY increase the voltage. So, the next logical question is what is a safe temperature, and Intel says 105C is the maximum safe temperature, and that’s what I go by.
Quote:
Originally Posted by Page #4 about 1/2 way down
CPU Vcore
That brings us to the first thing that most users want to play with after powering up their new system for the first time: CPU voltage, aka “Vcoreâ€. As you can see, this is actually one of the last things you should be changing. I would recommend starting at a nice and easy 1.2V. Surprisingly enough, many users are able to achieve very good overclocks with this modest amount of CPU voltage. I would be surprised if sample #1 needed any more than that, sample #2 probably need a bit more, and sample #3 will probably need quite a bit more.
So no, I do not list a specific value. This is because I believe it varies based on your cooling capacity For instance, I recently built MAX11L (the rig in my sig) and I was using an H70 for cooling. My best OC with the i5 670 CPU was 4.8GHz with 1.475V which hit 101C while running LinX....see the screenshot below



If you have extrodinary cooling, like a high end custom water cooling loop, you're unlikely to become tempurature limited with Clarkdale. In that case, I would be hesitant to run these chips much past 1.5V. If you are running sub-zero cooling like a single stage phase change, maybe up to 1.6V would be OK.....but this isn't an exact science. Below was my best 24/7 type OC with the same chip with a custom water loop.



As you can see in the screenshot, I was keeping the chip near 1.5V despite the fact that my temps were well below the 105C cap. In this case, I would base your max voltage on the behavior of the chip and the way it is scaling with the voltage you're giving it. What I mean by that, is when you increase voltage, at lower speeds you should see significant speed increases with small voltage increases, as you start nearing a particular CPU's limit, you'll notice a drop off of the speed increase given similar voltage increases.....when you reach the point where the CPU doesn't want to speed up much, even with a large voltage increase.....and it seems like you're hitting a "wall".....that's because you're hitting a "wall"

In this situation, there is diminishing returns for voltage increases, and these high voltages are more likely to damage the CPU despite sufficient cooling.

So, I'm not explaining all this to change my suggestions....just trying to provide a bit more insight into my reasoning

Quote:
Originally Posted by dave2z View Post
EDIT: Great guides btw Miahallen
Thanks Dave
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