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Complete Overclocking Guide: Sandy Bridge & Ivy Bridge | *ASRock Edition* - Page 749

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post #7481 of 9531
Quote:
Originally Posted by Goooober View Post

Hi Guys,

Bit of an OC'ing noob here and i've been playing around with thing after following the guide on page one to see where i can get with my Z68 Extreme4 Gen3 and 2500k. I've uploaded some screenshots of my current bios settings as well as one of my temps and voltage whilst running prime95 (albeit for only 5 minutes it or so).












You'll note that i'm actually running a fairly heft negative offset. I found that to keep temps manageable (i.e under 70c) I needed to bump the voltage down quite a bit. Despite running a 4.5ghz OC everything seems stable after 20 minutes or so of Prime95. I know 20 minutes is nothing really but in the past i've always found my unstable OC's to fail within seconds.


What i'd like to know is why im seemingly able to run a decent enough OC with negative offset? I thought any OC would always mean bumping the vcore up, not down. Of course, i fully admit i'm an amateur at this so i may be missing something (or even a lot of things).


Thanks

Your offset is ok, as long as it's stable, but you should run Prime for at least 8 hours to be sure that it's really stable. I had mine failed at 3.5 hours before.
On my 3570K, when I set all cores to 4.0GHz, my offset was -0.15V. And I can run my stock speed fully stable with -0.2V offset.
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post #7482 of 9531
Quote:
Originally Posted by scione View Post

Warning: Spoiler! (Click to show)
Quote:
Originally Posted by Goooober View Post

Hi Guys,

Bit of an OC'ing noob here and i've been playing around with thing after following the guide on page one to see where i can get with my Z68 Extreme4 Gen3 and 2500k. I've uploaded some screenshots of my current bios settings as well as one of my temps and voltage whilst running prime95 (albeit for only 5 minutes it or so).












You'll note that i'm actually running a fairly heft negative offset. I found that to keep temps manageable (i.e under 70c) I needed to bump the voltage down quite a bit. Despite running a 4.5ghz OC everything seems stable after 20 minutes or so of Prime95. I know 20 minutes is nothing really but in the past i've always found my unstable OC's to fail within seconds.


What i'd like to know is why im seemingly able to run a decent enough OC with negative offset? I thought any OC would always mean bumping the vcore up, not down. Of course, i fully admit i'm an amateur at this so i may be missing something (or even a lot of things).


Thanks

Your offset is ok, as long as it's stable, but you should run Prime for at least 8 hours to be sure that it's really stable. I had mine failed at 3.5 hours before.
On my 3570K, when I set all cores to 4.0GHz, my offset was -0.15V. And I can run my stock speed fully stable with -0.2V offset.

There is another aspect of negative offset that is harder to diagnose than load stress testing. When you use offset, it is applied to the entire voltage*multiplier curve. When we go negative to try to reduce voltage at load, we are also reducing it at idle. This can lead to idle instability. Idle stability is a real pain to test, as there is no "stress test" program like the ones we are accustomed to for load testing.

Negative offset is fine for many applications. Some chips can idle REALLY low, others not so much. So just like finding that sweet spot for the load, no one can tell you exactly where that idle stability line is, you will have to find it for yourself...without the aide of software.
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post #7483 of 9531
So how do you test for idle stability with negative offset? I'm interested in trying a negative offset to see if it can help my temps go down. smile.gif
post #7484 of 9531
Quote:
Originally Posted by choLOL View Post

So how do you test for idle stability with negative offset? I'm interested in trying a negative offset to see if it can help my temps go down. smile.gif

The easiest way for me to test idle is leaving computer on all day all night and do nothing. Can't be anymore idle than that.

Also my 3570K sucks, bad. My stock Vcore at load is like 1.26 or something. So to get to 4.0Ghz, I have to do negative offset of (-0.15) to get to 1.1V, which is normal voltage for that speed from what I've seen from other people.
Edited by scione - 11/27/13 at 5:45am
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post #7485 of 9531
Hi everybody,

I tried to follow the guide by the letter, as I am still a noob in OC.
So I Set the Offset to +0.005v and Turbo Boost to +0.004v, while my multiplier is at x45 (I got a bluescreen while trying x46).
The prime tests went well for like an hour. I played for like another hour BF4, without any BSOD. The core temps never exceeded the 70-75°.
The first problem is that, while prime95 is working, i've got a lot of drops in frequency and vcore. The frequency drops down to 3.3GHz and now an then gets back to 4.5GHz.
But it stayed at 4.5GHz when playing BF4. Is this normal?

The second and real problem, is than now, each time I shutdown my computer, windows shuts down, but the computer doesn't really power down, except for the monitors. Any ideas what this can be related to?

Thanks everybody

My config:
i5-2500K
ASRock Z77-Pro4
Corsair 8GB RAM
post #7486 of 9531
Quote:
Originally Posted by bloodysoul View Post

The first problem is that, while prime95 is working, i've got a lot of drops in frequency and vcore. The frequency drops down to 3.3GHz and now an then gets back to 4.5GHz.
The same here. It can't even handle 4.3Ghz and constantly drops it to 3.8Ghz.
I guess it only happens with 100% cpu usage.
Edited by fgsfds - 11/27/13 at 9:32am
post #7487 of 9531
Quote:
Originally Posted by choLOL View Post

So how do you test for idle stability with negative offset? I'm interested in trying a negative offset to see if it can help my temps go down. smile.gif

let it idle with menial tasks. YouTube maybe. Anything that puts a small load on the system that doesn't cause it to step off of the lowest multiplier. Check your event viewer for WHEA errors occasionally. It is impossible to say "Do XYZ and you can consider your system stable", there is no test.



Quote:
Originally Posted by fgsfds View Post

Quote:
Originally Posted by bloodysoul View Post

The first problem is that, while prime95 is working, i've got a lot of drops in frequency and vcore. The frequency drops down to 3.3GHz and now an then gets back to 4.5GHz.
The same here. It can't even handle 4.3Ghz and constantly drops it to 3.8Ghz.
I guess it only happens with 100% cpu usage.

can both of you post up screen shots of your BIOS settings? Something is not right here.

Also, what program are you using to monitor when you see the drop? Have you tried alternative monitoring software?
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post #7488 of 9531
Quote:
Originally Posted by inedenimadam View Post

can both of you post up screen shots of your BIOS settings? Something is not right here.

Also, what program are you using to monitor when you see the drop? Have you tried alternative monitoring software?

Here's mine.

http://i.imgur.com/AMRsu0L.png
http://i.imgur.com/ekA6BJY.png
http://i.imgur.com/EGR5dZm.png

And I'm using Aida64 and CpuZ for monitoring.

UPD: It seems it starts to drop frequency when temperature goes over 70 C.
Edited by fgsfds - 11/27/13 at 12:18pm
post #7489 of 9531
Quote:
Originally Posted by inedenimadam View Post

Also, what program are you using to monitor when you see the drop? Have you tried alternative monitoring software?

@fgsfds: do you also have a shutdown problem?
I am using CPU-Z to monitor, and prime95 to stress the cpu.
Here are mine:




post #7490 of 9531
Anyone here know why when I set my core anywhere over 48ghz it still only shows up as 47ghz in CPU-Z?

It literally won't go above 4700mhz at all. Weird. What could be causing this?
     
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