i7 Overclocking Tips? 5 replies

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*The.Doctor

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25th November 2003

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#1 8 years ago

I'm trying to get the best 24/7 OC i can out of my i7-860, which seems to be a good clocker considering the voltages it needs, but i keep running into some problems after i go over 3.8Ghz.

So far i've got it to 3.8Ghz while being completely stable using the following settings:

181x21 / HT on vCore: 1.23v QPI/VTT volts : 1.22v QPI multi: x36 (6.5GT/s) ram: x8 (1448Mhz) 1.50v

I've got it to pass a 5-hour OCCT test (quit the test since i had to leave for work) with no problems at 4.0Ghz but keep getting random BSODs while just messing around on the desktop or multitasking with these settings:

191x21 / HT on vCore: 1.32v QPI/VTT volts: 1.26v QPI multi: x32 (6.1GT/s) ram: x8 (1528Mhz) 1.50v

Should i start adding more vcore or more vtt volts? I don't know how much i want to raise the vtt volts since after reading a couple other forums it seems the limit for these Lynnfield chips is much lower than the Bloomfields, some people are only recommending not much over 1.20v for 24/7 use. It this just people being overly cautious, or is there truth to that?

The biggest question i have right now is getting my ram speed up. These G.Skill Ripjaws should be able to do much better than what mine are running at. The next step in ram speeds settings @ 3.8Ghz would put them at 1810Mhz, which according to a lot of people and reviews, they should be able to do, but i can't get them there. As soon as i set them to 1810 i either get a instant BSOD or a POST faliure. I've tried running them at 9-9-9-24 2T with 1.64v and no luck. In fact, i get the same problem with them clocked barely over 1600, no matter the voltage.

Also, is there any way to use the x36 QPI multi with the 191 bus speed? (which would be 6.87GT/s). I get a instant BSOD with something about a unrecoverable hardware error or a machine check exception as soon as i try it.

I'm not too concerned with temps right now since i'll have a better sink on the way soon, i just want to get it stable for now, at the best speeds i can. Its a lot of questions, but i know there are a few others here with i5/i7 setups.

Any suggestions?




kow_ciller

Gettin' hardware chilly

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16th June 2004

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#2 8 years ago

I always run HT/off since temps are WAY lower. But you might want to try this

200x21 / HT off vCore: 1.42 QPI/VTT volts: 1.38 2000mhz 9-9-9-24 1T 1.695v

Yes, people are wimping out on lynnfield when it comes to volts. I've thrown as much as 1.6v on the VTT and had no issues whatsoever. The vcore though is a different beast all together. Sometimes it will clock higher with less volts than more, and needs certain ranges to do better clocks. Way different than 775. The reason you are getting BSOD with your ram at a higher speed is because you dont have enough VTT/ ram volts.




*The.Doctor

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#3 8 years ago

No good. POST fail.

I tried 1810 with those volts as well with no luck.




kow_ciller

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#4 8 years ago

Hmm... could be that you just have some really badly binned sticks.

You can keep putting ram into your volts until around 1.76v to be fine under daily use. Just make sure your VTT voltage is within .5v of the vdimm voltage to ensure safety.




*The.Doctor

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#5 8 years ago
Hmm... could be that you just have some really badly binned sticks.

I think i may have. I might just use these for now and pick up some 2000 or better rated sticks later. I'm disappointed in these ripjaws, my PI series DDR2-1200 sticks rocked, these not so much...

I'm not comfortable with running that much ram volts through these i7's with their on die controllers. I didn't think 1.7+ volts was anywhere near safe for these? IIRC the max recommended was around 1.65?

4.0Ghz is now stable so far. All it needed was the VTT bumped up to 1.28.




kow_ciller

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#6 8 years ago

extra ram volts doesn't affect the IMC at all. The only voltage that you can mess with that will affect the IMC is the VTT. Everything else is independent. Extra voltage wont hurt it at all. With that 1.28v for the VTT you can go 1.78v on the mem and be perfectly fine since you need to stay within .5v of the VTT to be 100% safe (although that myth has been busted and you can be up to 1v different without any harm to your chip)