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Complete Overclocking Guide: Sandy Bridge & Ivy Bridge | *ASRock Edition* - Page 528

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post #5271 of 9489
I ran the custom test for overnight and it went for 10 3/4 hours before failing at 4.6 GHz.

Have now had 4.4GHz running at -0.065 offset and lowest PLL the Z77 Extreme4 will let me set, and it has been stable for 17 hours. I am going to keep running it overnight and then shut it off in the morning. VCore is pretty steady at 1.2 and temps have stabilized high 50's. Highest any core has gotten briefly is 71.

Not sure if I want to try to go higher again, as it takes a lot more voltage past 4.4GHz.
    
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post #5272 of 9489
Quote:
Originally Posted by spoonium View Post

I wonder, do you have an established procedure how to determine the actual Vcore you're posting in this thread? Due to Vdroop it can vary quite a lot in the various Prime tests, so do you have one specifically chosen for this?

I think you should clarify this in the guide. Some people may be posting their idle voltage, others their Prime voltage on light load, and even others for LinX or IBT. It makes it rather confusing to compare.
1.5v under heavy load could actually be a lot more under semi load or even idle (if power saving features are disabled), and there is a chance you won't even notice that if you're not aware of this already and are only testing with full load (as you're never going to see the higher voltages that way).
So you should be aware that the 1.5v mentioned are only valid for idle with all power saving settings disabled. If you're actually seeing 1.5v under Prime, chances are that you're spiking well over it already.


I myself use either Prime 960k for 26.6, or 864k in Prime 27.9 to determine the Vcore. Both settings seem to stress the CPU the most and will cause the largest Vdroop and hence the lowest Vcore (as long as LLC doesn't interfere too much, but I have that disabled altogether anyway).
Also, LinX does ramp up the load even one more notch and will display an even lower Vcore than Prime on any run (and higher temps, too).

You seem to have a good grasp of the vagaries regarding vcore. and yes, windows will draw a transient voltage spike that is alarmingly high. the "light" reading on this I have done indicates that it is only a potential spike with little actual current... so not really "dangerous"... but I still do not like it to be above 1.5V for my comfort/sanity. many other overclockers with a lot more experience than me ignore it.

one point you made that is concerning: LLc and vdroop. Defeating vdroop is probably not a good thing to do when using offset OC. Or maybe with fixed too. this is an engineering solution to high continuous current flow intel specifically designed to address full loading of the proessor... to slow degradation.

If you want to work anywhere near intel's recommended vcore max on air/water you really should use a DMM and read it directly from the board. It does differ from what the OS-based programs report.

for instance, on this Z77 OC formula the actual vcore is a few mV lower than what cpuZ or OHM report for the rig "in the works". My Ext3Gen3 seems to be low also, but I have only measured it one time.
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post #5273 of 9489
Quote:
Originally Posted by Gronnie View Post

I ran the custom test for overnight and it went for 10 3/4 hours before failing at 4.6 GHz.

Have now had 4.4GHz running at -0.065 offset and lowest PLL the Z77 Extreme4 will let me set, and it has been stable for 17 hours. I am going to keep running it overnight and then shut it off in the morning. VCore is pretty steady at 1.2 and temps have stabilized high 50's. Highest any core has gotten briefly is 71.

Not sure if I want to try to go higher again, as it takes a lot more voltage past 4.4GHz.

I would have called that 46 stable for most every normal use. have you checked event viewer for WHEA errors?
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post #5274 of 9489
Quote:
Originally Posted by Aleckazee View Post

With the whole stress testing stuff, is it really necessary to test for 12+ hours if the longest I ever game is an hour or so? Could I just stress test it for say 2 hours?

Just to give you an example of why i recommend 8-12 hours

W/ my 2500k OC at 4.6ghz

-0.010 offset & +0.065 turbo = BSOD 124 after 2 hours
-0.010 offset & +0.074 turbo = Worker 2 stopped after 6 hours
-0.010 offset & +0.078 turbo = Passed 8 Hours of custom blend

Its up to you but overall your system will be more stable if you run P95 for a good amount of time
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post #5275 of 9489
Quote:
Originally Posted by M0reP0wer View Post

So I reduced the offset by -.005 or -.0005 (I forget the exact decimals) and I ran the torture test for an hour and the temperature peaked only at 83 degrees the whole time. it was a 46 multi and the voltage fluctuated between 1.296 and 1.312. Is this a safe long term overclock? Anything else you think I should do?
You could still drop the offset some until it becomes unstable and then bring it back up. That way it is at the lowest possible VCore for that clock. Also note that decreasing the offset is likely to make your idle unstable instead of your load. Otherwise, it sounds like you are in the home stretch.
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post #5276 of 9489
Quote:
Originally Posted by Jpmboy View Post

You seem to have a good grasp of the vagaries regarding vcore. and yes, windows will draw a transient voltage spike that is alarmingly high. the "light" reading on this I have done indicates that it is only a potential spike with little actual current... so not really "dangerous"... but I still do not like it to be above 1.5V for my comfort/sanity. many other overclockers with a lot more experience than me ignore it.

one point you made that is concerning: LLc and vdroop. Defeating vdroop is probably not a good thing to do when using offset OC. Or maybe with fixed too. this is an engineering solution to high continuous current flow intel specifically designed to address full loading of the proessor... to slow degradation.

If you want to work anywhere near intel's recommended vcore max on air/water you really should use a DMM and read it directly from the board. It does differ from what the OS-based programs report.

for instance, on this Z77 OC formula the actual vcore is a few mV lower than what cpuZ or OHM report for the rig "in the works". My Ext3Gen3 seems to be low also, but I have only measured it one time.

AMEN to all of that! Particularly in this thread where there are people running on the ext4 and ext6 REALLY need to be aware of the TRUE VCore as reported by a DMM.
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post #5277 of 9489
Got most of my 670 problems solved -- back to this stuff!

Jpm, I will do a x46 test for you tomorrow. It's been so many days, I forgot what my Turbo was set at because I was running stock.

tongue.gif
post #5278 of 9489
Quote:
Originally Posted by Jpmboy View Post

Quote:
Originally Posted by Gronnie View Post

I ran the custom test for overnight and it went for 10 3/4 hours before failing at 4.6 GHz.

Have now had 4.4GHz running at -0.065 offset and lowest PLL the Z77 Extreme4 will let me set, and it has been stable for 17 hours. I am going to keep running it overnight and then shut it off in the morning. VCore is pretty steady at 1.2 and temps have stabilized high 50's. Highest any core has gotten briefly is 71.

Not sure if I want to try to go higher again, as it takes a lot more voltage past 4.4GHz.

I would have called that 46 stable for most every normal use. have you checked event viewer for WHEA errors?

Just checked the logs and the 4.6 had TONS of WHEA errors followed by a kernel error when it crashed. I had it set to +0.060 offset and PLL of 1.709. Voltage mostly stayed at 1.28 with a peak of 1.312. Would try it again with a bit more vcore but one core got up to 85 and I'm not sure I want to go much higher.

The 4.4 GHz test has been stable now for 23 hours with no errors at all in the event viewer.
    
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post #5279 of 9489
Been messing with this for most of the night and finally found a stable settings for 3.5ghz.



Its been 30 min on prime custom settings with maxes being 1.272vcore, 89 celcius. Off set is set to -.010v, turboboost at .072v or somewhere around there, LLC level 3 and PPL at 1.71v.



The vcore seems fine as its under 1.3v but the temps are high at 89 max and i can see alot of you guys would perfer staying lower then that at max. Im gonna leave prime95 running all night and take a screen of my bios, but what else could i do?
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3570K Rig
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570K AsRock Z77 Extreme 4 Sapphire VaporX HD 7970 GHZ Edition Crucial Ballistic Sports CL9 16GB (4GB x 4) 
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Samsung 830 128GB SSD (os) Samsung 840 120GB SSD Seagate 3TB 7200RPM HDD LG DVD OEM Writer 
CoolingOSMonitorMonitor
Hyper 212 EVO Windows 8 Dell 24" S2440L BenQ RL2450HT 
KeyboardPowerCaseMouse
Microsoft X4 Sidewinder Thermaltake SMART 850W Modular NZXT Phantom 410 Mid-Tower Logitech G400s 
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XTRAC Ripper XXL  Klipsch Promedia 2.1 
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post #5280 of 9489
Quote:
Originally Posted by Jpmboy View Post

for instance, on this Z77 OC formula the actual vcore is a few mV lower than what cpuZ or OHM report for the rig "in the works". My Ext3Gen3 seems to be low also, but I have only measured it one time.
Really? I've read reports where the OCF suffers from the same faulty readings like other Asrock boards, where it does report a too low Vcore via software and the actual voltage delivered is higher.
Where did you measure, on the points provided on the board, or on the solder pins on the back? I would rather trust the solder pins, considering that they are way nearer to the CPU.
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