i7-2600k oc voltages

[Sunburn74]

Yeah only issue is my box regularly will pass linx with flying colors but will fail prime blend...

man I guess I need a tutorial on how to stress test again! Back in the old days I was under the impression if it runs prime blend for 24 hours you are rock solid stable. Guess things have changed.

 

[felang]

ASUS mobo's have the same feature, its not called "dvid" though, it's just refered to as "offset".

At stock clocks, my 2600K can function on so little Vcc while fully loaded in LinX that the offset can become quite large.

So large in fact that the system becomes unstable during idle because the large negative offset results in the idle voltage being around 0.7V.

So for my system, I either use excess volts at load or excess volts at idle, I can't have the best of both worlds.

What we need the mobo makers to do is code the bios to let us specify our own fixed Vcc versus multiplier table.

16x = 0.800V
34x = 1.110V
38x = 1.120V
45x = 1.334V

And so on. Kind of like a user-defined fan profile or shmoo plot.

Asus boards have an option to increase "turbo offset" independently from the normal offset voltage I think. Played with it a couple of months back but it didn´t seem to work to well, maybe newer bios versions have improved it???

 

[Idontcare]

Yeah only issue is my box regularly will pass linx with flying colors but will fail prime blend...

man I guess I need a tutorial on how to stress test again! Back in the old days I was under the impression if it runs prime blend for 24 hours you are rock solid stable. Guess things have changed.

That to me suggests your box will likely pass prime95 small FFT but fail prime95 large FFT.

LinX does not test the IMC and L3$ in the way that large FFT will. If your instability is rooted in a non-core area then LinX would not be expected to ferret that out for you, neither would small FFT.

I have had a case where my ram was bad, it passed memtest+ so I thought it was good, but I kept failing LinX even with stock CPU clocks.

It turned out the bad ram was culprit but I found that out by running HCI memtest.

So we can't say it is all black and white. Sometimes the instability will manifest in a way that seems inexplicable.

 

[aigomorla]

u know what amazes me is now everyone takes 4ghz for granted..

seriously.. if u guys knew how much tuning it took on C2D to get 4ghz.. C2Q 4ghz.. and then bloomfield to 4.4ghz...

you guys seriously dont understand how easy stuff is for you now.

 

[Sunburn74]

What settings do you guys use to stress test with linx? How long do you run it? What memory size? Etc

And in the future I should run linx and then stress test with prime large ffts?

 

[Idontcare]

Choose the "all memory" option in LinX.

The order is more a matter of personal preference. Since errors in one component can propogate and become errors in another, there's no specific reason to give preference over one starting point versus any other.

However, whichever you decide to start with, if you detect an error you should then proceed to testing with the next one in an attempt to isolate the source of the error in terms of components.

 

[Sunburn74]

how long to run the test?

And to be sure its linx for CPU testing and Prime large ffts for memory testing?

And even if I have 16gb of ram, I can just run prime large as it is and it'll be fine?

 

[Idontcare]

For LinX, 20 runs is generally accepted as the "gold standard" of stability for your CPU's core logic. (with ALL mem enabled)

Prime large FFT is not so much for memory testing as it is for memory interface testing. The IMC and the L3$.

Naturally if you have errors in either your CPU cores or your memory then prime large fft will report errors as well, but we don't rely on large fft to detect this.

Yes you don't have to change anything in prime to account for the ram, just run large fft.

For testing the memory itself use HCI memtest. You can run 8 instances at one time, testing 2048 MB per instance, to speed up the testing.

 

[Plimogz]

Alright, slight thread rez. Please forgive me my necroing ways.

Concerning IMC/L3$ testing with Prime95 large-FFTs: Is there a particular voltage which should be tweaked when Large-FFT fails (computer restarts), but IBT loops seemingly forever? I'm trying to toy with system agent voltage instead of just piling on +offset. But for all I know, this could be entirely unhelpful.

Seems on-topic enough, dunno if I should've started a new thread, though.

edit: well, SA didn't help. I suppose I could have known that had I searched before posting, instead of the other way 'round. Anyway, I'm off to increase VCCIO instead. The above question still stands, however. Should anyone care to chime in.

 

[Kenmitch]

Alright, slight thread rez. Please forgive me my necroing ways.

Concerning IMC/L3$ testing with Prime95 large-FFTs: Is there a particular voltage which should be tweaked when Large-FFT fails (computer restarts), but IBT loops seemingly forever? I'm trying to toy with system agent voltage instead of just piling on +offset. But for all I know, this could be entirely unhelpful.

Seems on-topic enough, dunno if I should've started a new thread, though.

edit: well, SA didn't help. I suppose I could have known that had I searched before posting, instead of the other way 'round. Anyway, I'm off to increase VCCIO instead. The above question still stands, however. Should anyone care to chime in.

Might be better off starting your own thread. But seems kinda on topic of the original posting anyways.

Start by listing your full system specs as it'll help others help you. Maybe list what you've already tried to get your system stabalized.

 

[blackened23]

Hey so I want to run something by you guys.

I have a i7-2600k a ga-p67x-ud and 16gb corsair vengeance ram. Right now to run the chip at 4.4ghz, I need about 1.26-1.27 v (0.4 v below stock voltage). To run the chip at 4.6 i need about 1.33v (0.15 v above stock voltage). WIth that my load goes up about 4-5 deg celcius

Do you guys think its worth the voltage and heat to go up to 4.6 ghz? Or am I doing something wrong?

With my oc all power features are on and so is hyperthreading. The only thing I really need to adjust is voltage vcore specifically using the dvid method. Pretty much everything else is on auto.

1.33vcore should be fine if your cooling is up to it. I'm assuming you're not using the junk stock cooler, yes?

The big threshold is usually 4.8ghz - that requires 1.425+ vcore on average, while 5ghz+ requires 1.5vcore in many cases. Thats if you're lucky enough to get that high, some chips can't.

 

[fastamdman]

You can run 1.45 vcore 24/7 as long as temps are within spec. I personally like to try and stay at 1.4 or under for 24/7 use. If I had your processor I would find the highest 24/7 stable clock that 1.4 or 1.45 would allow and I would run that.

This 2500k that I recently sold takes 1.39 to get 12+ hrs of LinX stable at 4.5ghz. A lot of chips require less vcore but oh well.