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post #11 of 15
Thread Starter 
Hey Guy,

thanks for the replies.

Quote:
Originally Posted by Agenesis View Post

Most Haswell-E hexacores hits a ceiling at 4.5ghz. It isn't stable simply because your chip isn't capable.

My 5930k 4.5ghz takes 1.365v for it to be prime stable. Prime is really quick at finding any instability so I recommend tweaking your settings until it can pass at least an hour of it then move on to x264 encoding benchmark found on the devil canyon thread.

First it'll crash, as you make more refinements only individual threads will crash. I find working in reverse works best. Use the max "safe" voltages and decrease it until it crashes. vcore and input voltage are the two key voltages to getting a stable overclock.

Ok, this is what I get from you response:
1.) Try to get the OC stable within Prime95 for at least an hour.
2.) Do the long-term stress testing with x264

I'll try that later, but I'm a bit afraid of doing a 1h stress test with Prime95 because of the temps prime is putting on my CPU. In an 30min run of Prime95 4.5GHz @ 1.30v Vcore i had temps. like avg. 87°C and peak of 90-92°C.

By the way, what FFT size are you using for your 1h Prime95 test and which version of Prime95 are you using?

Quote:
Originally Posted by Some Random Guy View Post

My difference between 30 minutes of stability and 24 hours of stability for me was in the realm of .05V. This might be what you're running into. I usually do 1 hour before trying to move on to the next multiplier. It took me 5 bumps once I settled at 4.5 on my i75820k.

... it's time-consuming and even frustrating from time to time.



Results of my 8h RealBench re-validation over night:



RB 8h stress test: Passed! (4.5GHz @ 1.28v Vcore) => no difference in using the SATA controller 1/2


Regards,
Chopchop2
Edited by ChopChop2 - 8/23/15 at 12:33am
post #12 of 15
Thread Starter 
Hey guy,

here are some more results, I did 3 runs of Prime95 v2.79 and 3 of Prime95 2.66 each for 15min, a FFT of 1344k and an ambient temp. of 24.5°C.

Prime95 v2.79 (4.5GHz, 1.28v Vcore):
Run1: FAILED after 7min
Run2: FAILED after 2min
Run3: FAILED after 14min

Prime95 v2.79 temps (4.5GHz, 1.28v Vcore):
After 5min


After 10min


After 14min



Prime95 v2.66 (4.5GHz, 1.28v Vcore):
Run1: PASSED
Run2: PASSED
Run3: PASSED
Run4: PASSED (1h run!)

Prime95 v2.66 temps (4.5GHz, 1.28v Vcore):
After 5min


After 10min


After 15min


After 1h



Summary of results (OC 4.5GHz @ 1.28v Vcore):
The results of Prime95 v2.66 are in line with the results of RealBench and XTU and this according to temps and stability. Further more I'v played a whole evening (~8h) MWO using this OC without a problem (It's said that MWO is a pretty CPU intense game). Prime95 v2.79 on the other hand can't be handled by the system / the OC for longer than 14min (in 3 test runs) and It's producing a way more heat (avg.: +6°C).

What's the truth guys ... ? Is the OC stable or not? Is the OC too hot or just right? Is there any room left for some more OC or is it already over quota?


Regards,
Chopchop
Edited by ChopChop2 - 8/23/15 at 3:54am
post #13 of 15
If you disable memory stress on aida64 you won't get the out of resources message.
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Sherman
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post #14 of 15
Thread Starter 
Quote:
Originally Posted by benjamen50 View Post

I've only heard this rumor affects CPU's that are running under an adaptive or offset voltage. A 0.1v+ increase due to using certain versions of Prime95, usually the newer versions. I stick to Prime95 v26.6 or v27.9.

For Intel XTU, I do usually 10 benches to do a quick and easy stable check for CPU overclocks. For the stress testing on Intel XTU, I recommend around 1-3+ hours. Honestly myself I don't even test long for my overclocks. I've only done up to 30 minutes to an hour.

Results of 8h XTU:


Quote:
Originally Posted by Agenesis View Post

Most Haswell-E hexacores hits a ceiling at 4.5ghz. It isn't stable simply because your chip isn't capable.

My 5930k 4.5ghz takes 1.365v for it to be prime stable. Prime is really quick at finding any instability so I recommend tweaking your settings until it can pass at least an hour of it then move on to x264 encoding benchmark found on the devil canyon thread.

First it'll crash, as you make more refinements only individual threads will crash. I find working in reverse works best. Use the max "safe" voltages and decrease it until it crashes. vcore and input voltage are the two key voltages to getting a stable overclock.

Results of 1h Prime (v2.66):
See above

Results of x264:


x264_1080p-24-08-2015_2.rtf 1k .rtf file

Quote:
Originally Posted by Some Random Guy View Post

My difference between 30 minutes of stability and 24 hours of stability for me was in the realm of .05V. This might be what you're running into. I usually do 1 hour before trying to move on to the next multiplier. It took me 5 bumps once I settled at 4.5 on my i75820k.

Quote:
Originally Posted by Blockheed View Post

If you disable memory stress on aida64 you won't get the out of resources message.

Results of 8h AIDA64:





Regards,
Chopchop2
Edited by ChopChop2 - 8/23/15 at 11:27pm
post #15 of 15
Best thing to do next is runs the software that the PCs is being used for? 24/7 work station? Because that looks pretty stable except for maybe temps. At the end of the day, certain apps and games will be rock solid at this clock/voltage but if the one you use the most is unstable its back to the drawing board. I think any higher and its time for custom loop water cooling.
Edited by Blockheed - 8/23/15 at 11:53pm
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Sherman
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