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Haswell Overclocking Guide [With Statistics] - Page 1140

post #11391 of 19540
My understanding is that the minimum VID (0.7V in my case) for the 800MHz eist, is programmed into the cpu and probably determined through intel’s testing, but (the actual core voltage) is dropped further by the c states at idle. And anything above 0.7V vill vary from one core to the next according to the load.

Still, even though that 0.062V and 0.171V sounds plausible for idle (especially if it is linear throught the cores as you say), the 0.003 voltage sounds to me like it is a result of what i just said (a determined voltage not an actual reading). Edit: it seems this claim came from a previous post, further back than what i read, belonging to coelacanth, and was about cache voltage.

Quote:
Originally Posted by Forceman View Post

... but the point of testing it was to show that C6/7 does allow lower voltage (or possibly just power) than C3 alone.

No, that is definitely voltage, the power (current density) will probably be zero since the C6/7 was triggered.

Quote:
C states are CPU idle states, S states are sleep states...

This is so embarrassing, not knowing this until this point. I never enabled C/S states before this platform though.. (i know it’s a lame excuse).
Edited by angelotti - 3/22/14 at 9:06am
post #11392 of 19540
I had an OC stable at 43/39 with 1.245VID/1.264vcore
RAM at 2400

It was stable IBT x10 very high and x264 x20
few hours of BF4

Tested ram with 300% memtest86

Wanted to see if I could lower the voltage and tried prime95 1344 with 80% ram. Got BSOD within 5mins.
I upped to 1.275 VID (1.296vcore)... freeze after 30min.

So another try back to 42x with 1.296 vcore... running prime95 atm...
Uncore is set to 8-39 auto voltage.
This sucks :/


My question is, should i just forget about prime95 and keep benching with x264 x20 and IBTx10 ?
Is prime instability really relevant ? :/
I see many people only using x264 and IBT...
Edited by Gugus03 - 3/22/14 at 4:33am
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post #11393 of 19540
Quote:
Originally Posted by Gugus03 View Post

I had an OC stable at 43/39 with 1.245VID/1.264vcore
RAM at 2400

It was stable IBT x10 very high and x264 x20
few hours of BF4

Tested ram with 300% memtest86

Wanted to see if I could lower the voltage and tried prime95 1344 with 80% ram. Got BSOD within 5mins.
I upped to 1.275 VID (1.296vcore)... freeze after 30min.

So another try back to 42x with 1.296 vcore... running prime95 atm...
Uncore is set to 8-39 auto voltage.
This sucks :/


My question is, should i just forget about prime95 and keep benching with x264 x20 and IBTx10 ?
Is prime instability really relevant ? :/
I see many people only using x264 and IBT...

ibt is great to provide temperature headroom .,however its not the best at finding stabilities. I first run a cinebench 15 then if it passes I run the intel extreme utility benchmark ( not stability test). both of those will take about ten minutes. next move to your prime run. if your are atleast prime stable for 30mins. try and run you games, apps ect. stable is sort of subjective imo.

as long as your temps are in check you will be fine moving that vcore up to 1.35v as needed for 24/7 use. I ran mine at 1.42 without issues. I did settle back down to 1.325v atm though.
Edited by Wirerat - 3/22/14 at 5:13am
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post #11394 of 19540
Quote:
Originally Posted by Gugus03 View Post

My question is, should i just forget about prime95 and keep benching with x264 x20 and IBTx10 ?
Is prime instability really relevant ? :/
I see many people only using x264 and IBT...

Prime 95 validation of the OC is indicative of stability relative to few real world scenarios. Some people say that if they crash under bf3/4 they crash under prime as well.
I myself, am not passing on the prime test, just for the peace of mind. I always try to pass 2-3h of prime (small and large fft’s) as well.
But most (non-synthetic) applications out there are easily covered by 5h+ of x264 stress test (at least 3h)
post #11395 of 19540
Quote:
Originally Posted by Wirerat View Post

ibt is great to provide temperature headroom .,however its not the best at finding stabilities. I first run a cinebench 15 then if it passes I run the intel extreme utility benchmark ( not stability test). both of those will take about ten minutes. next move to your prime run. if your are atleast prime stable for 30mins. try and run you games, apps ect. stable is sort of subjective imo.

as long as your temps are in check you will be fine moving that vcore up to 1.35v as needed for 24/7 use. I ran mine at 1.42 without issues. I did settle back down to 1.325v atm though.

Ok thanks.

I may tro to up at 1.3+ vcore.

I also noted that at stock settings, my vcore goes up to 1.264...

Max temp was 83°, but with outside window open right next to the tower, some winter wind is always a good cooler biggrin.gif

EDIT: with vcore at 1.312 i reached 96° on IBT after 15sec but 88-90 on prime95
After thinking about it, since i never use synthetic applications, I may stick with x264 and XTU for benching and will see in real world usage if I get BSODs
Edited by Gugus03 - 3/22/14 at 5:39am
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post #11396 of 19540
Quote:
Originally Posted by angelotti View Post

My understanding is that the minimum VID (0.7V in my case) for the 800MHz eist, is programmed into the cpu and probably determined through intel’s testing, but (the actual core voltage) is dropped further by the c states at idle. And anything above 0.7V vill vary from one core to the next according to the load.
Still, even though that 0.062V and 0.171V sounds plausible for idle (especially if it is linear throught the cores as you say), the 0.003 voltage sounds to me like it is a result of what i just said (a determined voltage not an actual reading).
No, that is definitely voltage, the power (current density) will probably be zero since the C6/7 was triggered.
This is so embarrassing, not knowing this until this point. I never enabled C/S states before this platform though.. (i know it’s a lame excuse).

I'm the one that mentioned .003v but that was cache voltage, not Vcore. The lowest Vcore measurement I've seen is .016v.
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post #11397 of 19540
I can only get a x42 multiplier with 1,2Vcore, is this OK? Anything under that is BSOD.

I'm perfectly fine with 4,2GHz, I just want to know what other settings I should adjust as well? I don't want to overclock my ram or anything. Do I have to change the uncore to x39? And cache voltage?
post #11398 of 19540
Quote:
Originally Posted by coelacanth View Post

I'm the one that mentioned .003v but that was cache voltage, not Vcore. The lowest Vcore measurement I've seen is .016v.


I knew it wasn’t Forceman's claim, but i didn’t know it was yours nor, more importantly, that it was about cache voltage.
I only saw it in an “exchange” between Darkwizzie and FractinJex.
post #11399 of 19540
Thread Starter 

I was pretty civil to FractinJex. And you'll also notice that we were talking about what causes voltage drop. Somebody else commented and the conversation got sidetracked.

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post #11400 of 19540
Quote:
Originally Posted by brutus090 View Post

doh.gif
9.0.22.1467 is what shows now (804 bios), and sadly I don't have a screenshot from before to compare it to.

Your 804 BIOS has ME version: 9.0.2.1345. Your 1402 BIOS has ME version: 9.0.30.1482. Whatever BIOS you used before, that's the ME you still have. You can only change it if you do it manually which is easy enough.

As an example, update to latest. If you wanted another version, you'd use it's file.


Edited by error-id10t - 3/22/14 at 5:44pm
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