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post #21 of 51 (permalink) Old 05-16-2014, 12:55 PM - Thread Starter
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Double post, sorry.

k so you are saying before I can sing victory I need to run a 24hr test. If that passes then I'm golden? I used 4.2 at 1.2v last night for like 7 hr prime95 1hr bf4 3hr and titanfall 3 more hr and no crashes..

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post #22 of 51 (permalink) Old 05-16-2014, 01:12 PM
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I honestly wouldn't be surprised if it's stable on 1.2v, my 8320 is at 4.2 @ 1.2v on the same cooler biggrin.gif

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post #23 of 51 (permalink) Old 05-16-2014, 01:33 PM - Thread Starter
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I honestly wouldn't be surprised if it's stable on 1.2v, my 8320 is at 4.2 @ 1.2v on the same cooler biggrin.gif

really! Cool man this just made my day lol

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post #24 of 51 (permalink) Old 05-16-2014, 02:12 PM
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I don't overclock, so i am more forgiving than the old school overclockers. For me, when undervoting, 10-12h of Prime and 1 round (10 passes) of IBT at very high, have never failed. IMHO, if you pass 12h Prime, you 're good to go. But if the system is stable enough for you, then there is no rule on how much you want to run Prime. I just like to be 100% certain of my voltages.

EDIT: To save time, i do this: Start with IBT at very high. It's much quicker. When you find a voltage that IBT is stable, start running Prime. This way you don't waste Prime runs on voltages that are very unstable. For me, Prime can reveal more instabilities than IBT, but IBT is much better to weed out blatant instabilities quickly.

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post #25 of 51 (permalink) Old 05-16-2014, 03:45 PM
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The "benefit", is simply because the algorithms that are ran during Prime95, are not the same. If you look carefully, you will notice that they are different. And CPUs that aren't perfectly stable, will sooner or later fail in a different algorithm. I 've had undervolting attempts failing after 6 hours Prime. I 've had times where it would pass IBT but not Prime after 10 hours. Even more, i 've had times where it would pass Blend for 8 hours,but not largeFFT for less hours.

At the end, there are many users that are happy enough with "almost stable". But, to my experience, if you stress the CPU a lot, sooner or later, an instability in Prime, will show. A BSOD that happens once a month, a mysterious corruption of your windows installation, it can be anything. Then people go to fora and complain about software problems, that in reality were caused by their "non perfectly stable" overclock. Same applies with undervolting really...

T

Yup, people overclock and run Prime95 for like 20 minutes and are "stable" Then they get a few blue screens of death and some data corruption that comes with them. Then that corruption cascades and their Windows install is borked. Then you have the guys that spend days tweaking voltages, timings etc... Run Prime95 making sure no workers drop out, more tweaking.... They get fast overclocks and stable machines.

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post #26 of 51 (permalink) Old 05-16-2014, 03:48 PM
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k so you are saying before I can sing victory I need to run a 24hr test. If that passes then I'm golden? I used 4.2 at 1.2v last night for like 7 hr prime95 1hr bf4 3hr and titanfall 3 more hr and no crashes..


I think a few hours is enough. I always run at least two hours. The heat really starts to kick in after running Prime95 for 30 minutes.

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post #27 of 51 (permalink) Old 05-17-2014, 01:18 AM
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Practical examples of benefits of Prime>

Fail after 5 hours>

https://www.overclock.net/t/1196310/pls-help-stabilize-oc-on-prime95

Fail after 7 hours

https://www.overclock.net/t/1248220/i7-3820-failing-prime95-at-stock-speeds-is-it-the-cpu-the-motherboard-the-ram-or-something-else-how-do-i-figure-it-out

Fail after 9 hours:

https://www.overclock.net/t/1455123/4930k-at-4-4-ghz-fails-freezes-with-prime95-blend-around-9-hours-thoughts-almost-there

Fail after 10 hours:
http://www.tomshardware.co.uk/forum/254635-29-amd3700-prime95-fails

Fail after 18 hours:
https://www.overclock.net/t/472385/prime95-failed-after-18-hours-being-on-what-should-i-do

This is why old-school overclockers were calling it good after 24h. But then, it was more about a code of honour, less about posting CPU-Z validations of unstable overclocks.

Stability isn't subjective, but instability is. Many people can live with slight instability. Others, can live with more instability and even more, can live with Prime stable at 30 minutes. Heck, here people run Prime95 for 15 minutes. Ι wonder why they even bother, but just shows how people have changed in their ways.

http://forums.anandtech.com/showthread.php?t=2204675


Prime is slow, but relentless. If there is a minimum instability, it will take its time, but it will find it.

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post #28 of 51 (permalink) Old 05-17-2014, 06:21 AM - Thread Starter
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Quote:
Originally Posted by Undervolter View Post

Practical examples of benefits of Prime>

Fail after 5 hours>

https://www.overclock.net/t/1196310/pls-help-stabilize-oc-on-prime95

Fail after 7 hours

https://www.overclock.net/t/1248220/i7-3820-failing-prime95-at-stock-speeds-is-it-the-cpu-the-motherboard-the-ram-or-something-else-how-do-i-figure-it-out

Fail after 9 hours:

https://www.overclock.net/t/1455123/4930k-at-4-4-ghz-fails-freezes-with-prime95-blend-around-9-hours-thoughts-almost-there

Fail after 10 hours:
http://www.tomshardware.co.uk/forum/254635-29-amd3700-prime95-fails

Fail after 18 hours:
https://www.overclock.net/t/472385/prime95-failed-after-18-hours-being-on-what-should-i-do

This is why old-school overclockers were calling it good after 24h. But then, it was more about a code of honour, less about posting CPU-Z validations of unstable overclocks.

Stability isn't subjective, but instability is. Many people can live with slight instability. Others, can live with more instability and even more, can live with Prime stable at 30 minutes. Heck, here people run Prime95 for 15 minutes. Ι wonder why they even bother, but just shows how people have changed in their ways.

http://forums.anandtech.com/showthread.php?t=2204675


Prime is slow, but relentless. If there is a minimum instability, it will take its time, but it will find it.

well my PC has not crashed BUT! For running at 4.2 its very slugish... It freezes at times (slightly) but it is annoying do you think its because the CPU is not getting enough power at 1.2v?? I ran prime all last night no crash highest temp 58c.. But why so sluggish?

MOBO: Asus Sabertooth 990fx
CPU: FX-8320 (clocked at 4.0)
COOLER: Corsair H55 water cooler
GPU: EVGA GTX 760 2gb (SC)
PSU: Corsair 750watt gold
OS: Windows 7 Primium
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post #29 of 51 (permalink) Old 05-17-2014, 06:40 AM
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well my PC has not crashed BUT! For running at 4.2 its very slugish... It freezes at times (slightly) but it is annoying do you think its because the CPU is not getting enough power at 1.2v?? I ran prime all last night no crash highest temp 58c.. But why so sluggish?

I don't know. I can run Prime95 for hours and do all sorts of things like its not even running.

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post #30 of 51 (permalink) Old 05-17-2014, 06:50 AM
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Sluggishness can sometimes be attributed to the VRM throttling your CPU. While the CPU temp is perfectly fine, the VRMs are hitting a temp that forces them to throttle the CPU. Your CPU is then running at 1.4ghz on all cores, until the VRM temps lowers and hit an acceptable threshold.

You won't see this unless you are paying attention to your screen during a Prime95 test. If you are using IBT, the time column will tell you if throttling happen, because it will show that loop taking longer to complete.

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