Voltages 7 replies

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Mr. Pedantic

I would die without GF

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8th October 2006

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#1 9 years ago

Anyone remember a thread I made a while ago, where I complained I couldn't get my i7 past 3GHz? Well, I overvolted it, and I'm now running at 3.6GHz stable. It seems to have hit the same sort of wall, without more voltage it boots into Windows but it only gets through about 30 seconds of Prime before BSOD'ing. Which is where you guys come in.

I have my Vcore at 1.35 and memory at 1.55. I haven't overvolted QPI to my knowledge, though before I overvolted the Vcore it was sitting at 1.26 during load anyway (I think the i7 920 stock voltage is 1.2V?) so I wouldn't be surprised if that were overvolted by the motherboard.

I plan to keep this machine for at least five years, and would prefer it operational for another year or so after that, at least. What I need is some advice on how much I can overvolt it further if I want to keep it running for another five, six years. Or is 1.35 Vcore and 1.55 Vmem too much already?




Smitty025

The local Paultard

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24th May 2003

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#2 9 years ago

Have you tried running at those speeds with any lower voltages?

What are your temps?

What brand/model is your memory? Max memory voltage tolerances vary depending on what types of memory chips are used in the stick so they vary between manufacturers and models.

I'm assuming you have a motherboard with decent power management capabilities. If you have a shitty motherboard the margin of error for voltage settings may be much higher than you expect.




>Omen<

Modern Warfare

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#3 9 years ago

You will hear different opinions on that. Some say stock is 1.2, others 1.25, but mostly 1.2. It also depends if it's the older type i7 or the new DO stepping one as far as end results on OCing. I have heard some say they can go 3.8GHz with no over volting. That is using a DO stepped i7 920 showing a stock voltage of 1.25 on a Gigabyte EX58-UD5.

The MB does indeed matter. I like the Gigabytes, which have thick copper bases that have extremely good signal transfer and high bus speed. It's common to see 2000MHz memory standards with no OC required.

If you want to keep the rig that long, use good cooling on the CPU and don't go too high on the voltage, preferably no more than 1.25v if you can. Other than cooling and volting options, OC guides in general can vary. Most say you don't need to OC the uncore and won't get any noticeble performance gain from it, or even going above 1600MHz on the RAM.




Mr. Pedantic

I would die without GF

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#4 9 years ago
What brand/model is your memory? Max memory voltage tolerances vary depending on what types of memory chips are used in the stick so they vary between manufacturers and models.

G.Skill, it's 1333MHz, currently running at 1440. And apparently the i7 memory controller is quite sensitive to voltage, so Intel gives a recommendation of 1.65V absolute maximum.

What are your temps?

It idles at 28-30, Prime95 gets it up to about 57, and with CoreDamage it pushes 70.

Have you tried running at those speeds with any lower voltages?

No, I haven't. So those voltages are a bit high?

EDIT: I undervolted it by 10mV, and it's running Prime fine. To be fair, it's only been 4 minutes, but I've never had a BSOD or crash after a minute and a half, so it's looking good.




Oblivious

I tawt I taw a puddy tat...

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#5 9 years ago

You can use Core Temp to see what the VID (default voltage) is for the cpu.

CoreTemp




Mr. Pedantic

I would die without GF

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#6 9 years ago

Surprisingly, I've lowered my Vcore to 1.32V and it can still boot! I remember setting it to overvolt by 70mV in the BIOS and it getting a BSOD in Prime after ten seconds at 3GHz, and it's been half an hour already on Prime95 and it's perfectly fine! My temps are starting to look even better now, it took about 20 mins to get to 57 degrees, whereas on 1.35V it took about five minutes.

You can use Core Temp to see what the VID (default voltage) is for the cpu.

The VID box and text are greyed out.




kow_ciller

Gettin' hardware chilly

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#7 9 years ago

You might want to check this thread out i7 920.. The Sweet Spot (Optimal OC) - Overclockers Forums

Seems that if you game you might want to turn HT off. Hadn't really hear about HT on being slower in games until I saw that.




Mr. Pedantic

I would die without GF

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#8 9 years ago
Seems that if you game you might want to turn HT off. Hadn't really hear about HT on being slower in games until I saw that.

Meh. I don't mind. I don't play any newer games anyway (apart from WIC - and I can still max that out perfectly fine...though there does seem to be a stuttering issue...?), I'm playing through Far Cry right now and I get on average about 300fps, it's awesome. So I don't really need the extra FPS.

And I've pulled it back to 1.3V now, which should be pretty safe for the long run. I think I might try fiddling with my memory next, I'm pretty sure that 1440MHz isn't the best it can do.