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Do i need to run prime95 small and large after running blend - Page 2

post #11 of 19
Quote:
Originally Posted by kevindd992002 View Post

Ah ok. I'll try again with 90% RAM because that is what is indicated in the Sandy Stable thread. I hope that's enough though. Thanks!
Sidenote. Use 90%-95% of AVAILABLE RAM, not total RAM. Have fun with your OC.
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post #12 of 19
Thread Starter 
Quote:
Originally Posted by Grmadness View Post

Sidenote. Use 90%-95% of AVAILABLE RAM, not total RAM. Have fun with your OC.
thumb.gif

Yes, I know that smile.gif So you´re using 80% of AVAILABLE RAM when you use P95?
post #13 of 19
Yes. I always leave a space because when I Prime everything is on edge, and I really don't know a thing (and I admit it) about what happens with the processes that run in the background.
   
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post #14 of 19
You do not.

Blend is a mix of both small and large FFT. Small FFT is done during the 2nd fft pass (minutes 15-30), and it's best done as a temp test, not a stability test. Large FFT is for RAM but blend basically does a wide variety of large FFTs during the entire test.

No need to run IBT if you run 24+ hours of p95, as p95 is much more stressful than IBT (as long as you set priority to 10, or use task manager to set priority to above normal).

What I do, is set my max ram usage to 2500 (out of 4gb), or ~80%. That way, I can check my email real quick during stress testing. Also, I'll use task manager to set my priority to above normal when im away from the computer, then when I need to use it real quick, I go into task manager and set priority to normal (which takes a while because prime95 has higher priority than everything else).

People think IBT is more stressful than p95 or tests quicker, but that's because at default, IBT has a higher priority (whereas p95 defaults at the lowest possible priority, because it was designed originally as a compute workload program, not stress tester, so you could run it in the background) and tests more ram. Always make sure when using p95 to set the priority to above normal in task manager. If you don't that's fine, it just means an unstable system would crash quicker rather than later, but 24 hours is still just as exhaustive.

Congrats on a stable system. It makes no sense to me why someone would think 12 hours of p95 would mean something, but not go 24 hours. If you think prime95 is good enough that you'd use it for 12 hours, why would you only run half of the 80+ tests that prime95 executes during stress testing. Testing for 12 hours just means your system is 50% stable as far as I'm concerned. Meaningless. Most of my overclocks fail between 12-24 hours anyways (in the last week, I failed at 19, 16, 14, 12, and 3 hours).

Most of my faulty hardware was able to pass 12 hours of prime95, I was dumb to only test for 16 hours of prime95 at stock system settings when I upgraded my CPU, and then I spent the month tearing my hair out when it seemed like, say, 4ghz@1.3v was more stable than 3.8ghz@1.45v. Turned out if had just run p95 finish that run and go 24 hours, I would have realized my motherboard was faulty (or would have at least known that at stock settings the system was failing). Then I woudln't have been pulling my hair out wondering why the chip was such a bad overclocker and instead have focused on what part in my system was faulty.

A motherboard I had used for 3 years with no BSODs or issues, mind you. I don't know if the new cpu brought out the instability or what, but I had to reinstall windows when it crashed on a windows update.
Edited by Belial - 3/5/13 at 10:19am
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post #15 of 19
Personally I only run a few min (15 or so) of burn testing and then see if I get any crashes while playing games. I don't stress my system 24 hours straight during normal usage, so I don't see any reason to do that when testing an OC.
post #16 of 19
^ If all you do is game, and you dont care if you crash in a game, have to reinstall programs, or reinstall windows eventually, then no, stability testing doesn't matter too much. But I don't see why not find your 24/7 stable overclock, and if you are someone who doesn't care for stability, just add 200mhz to whatever your 24/7 overclock is?

I mean I paid a lot of money for this system, I want to know exactly what me and my friend for the next 5-10 years are going to be able to do together. That, and I stream, so a crash is completely unacceptable, and I have sensitive data. And I'm always swapping hardware so I don't want to be wondering why this new RAM is failing and crap when really my overclock is what's unstable.

I have never heard about this WHEA error thing OP. I went to Kernel-WHEA and I dont have any errors (the post about how to get a message any time you get a whea error) but when I go to custom-administrative I have quite a few errors.
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post #17 of 19
Thread Starter 
Quote:
Originally Posted by Belial View Post

You do not.

Blend is a mix of both small and large FFT. Small FFT is done during the 2nd fft pass (minutes 15-30), and it's best done as a temp test, not a stability test. Large FFT is for RAM but blend basically does a wide variety of large FFTs during the entire test.

No need to run IBT if you run 24+ hours of p95, as p95 is much more stressful than IBT (as long as you set priority to 10, or use task manager to set priority to above normal).

What I do, is set my max ram usage to 2500 (out of 4gb), or ~80%. That way, I can check my email real quick during stress testing. Also, I'll use task manager to set my priority to above normal when im away from the computer, then when I need to use it real quick, I go into task manager and set priority to normal (which takes a while because prime95 has higher priority than everything else).

People think IBT is more stressful than p95 or tests quicker, but that's because at default, IBT has a higher priority (whereas p95 defaults at the lowest possible priority, because it was designed originally as a compute workload program, not stress tester, so you could run it in the background) and tests more ram. Always make sure when using p95 to set the priority to above normal in task manager. If you don't that's fine, it just means an unstable system would crash quicker rather than later, but 24 hours is still just as exhaustive.

Congrats on a stable system. It makes no sense to me why someone would think 12 hours of p95 would mean something, but not go 24 hours. If you think prime95 is good enough that you'd use it for 12 hours, why would you only run half of the 80+ tests that prime95 executes during stress testing. Testing for 12 hours just means your system is 50% stable as far as I'm concerned. Meaningless. Most of my overclocks fail between 12-24 hours anyways (in the last week, I failed at 19, 16, 14, 12, and 3 hours).

Most of my faulty hardware was able to pass 12 hours of prime95, I was dumb to only test for 16 hours of prime95 at stock system settings when I upgraded my CPU, and then I spent the month tearing my hair out when it seemed like, say, 4ghz@1.3v was more stable than 3.8ghz@1.45v. Turned out if had just run p95 finish that run and go 24 hours, I would have realized my motherboard was faulty (or would have at least known that at stock settings the system was failing). Then I woudln't have been pulling my hair out wondering why the chip was such a bad overclocker and instead have focused on what part in my system was faulty.

A motherboard I had used for 3 years with no BSODs or issues, mind you. I don't know if the new cpu brought out the instability or what, but I had to reinstall windows when it crashed on a windows update.

Thank you for this extensive explanation mate! smile.gif

So you're saying that setting Prime95 to above normal priority would detect errors quicker than later?

Also, if I don't plan to use my computer for the duration of the torture test which is better between 90% or 95% of AVAILABLE RAM?

EDIT: I actually tried running both IBT and Prime95 now and looking at the set priority of both. They both have Normal priority? I thought IBT's default is higher than P95's? Also, why do you choose Above Normal for P95 and not High?
Edited by kevindd992002 - 3/5/13 at 6:09pm
post #18 of 19
Quote:
Most of my overclocks fail between 12-24 hours anyways (in the last week, I failed at 19, 16, 14, 12, and 3 hours).

By the way, when I said this, over the last week, I've actually been lowering an overclock, yet the failures have been occuring earlier and earlier. Just to make clear, failing later and later in prime95 is not, in and of itself, a sign of more stability, nor is being able to pass 12 hours of prime95 mean anything. I had an overclock on one run fail at the 19th hour, then I considerably lowered the overclock and failed at 3 hours. You have to test for at least 24 hours for stability.

Now if you, say, increase vcore and go from failing p95 from instantly to 6 hours to 15 hours, that's a good sign you're on the right track, but it's just as possible to fail 13 hours the next time you test if it isn't enough voltage.
Quote:
So you're saying that setting Prime95 to above normal priority would detect errors quicker than later?

Eh. Sure. To keep it simple, sure. I think you can figure out on your own exactly what happens when changing the priority of prime95 and what implications that has.
Quote:
Also, if I don't plan to use my computer for the duration of the torture test which is better between 90% or 95% of AVAILABLE RAM?

More is better, just make sure you don't write to disc. It'd depend how much your available ram fluctuates. I think there's a way to make sure that your system isn't writing to disc, by going into task manager, resource monitor, disc. Just make sure your HDD light isn't blinking more than when prime95 isn't running (it'll be obvious, and when p95 isn't running there's always a little activity so just a bit of blipping isn't bad).
Quote:
EDIT: I actually tried running both IBT and Prime95 now and looking at the set priority of both. They both have Normal priority? I thought IBT's default is higher than P95's? Also, why do you choose Above Normal for P95 and not High?
Edited by kevindd992002 - Yesterday at 9:09 pm

In Task manager, it'll come up as normal. In reality, priority goes on a scale of like, 1-20 i think? I'm not exactly sure on the particulars, but 2 programs coming up as normal in task manager does not mean they have the same priority. Are you sure you tested prime95 on it's default worker window of 1 though?

You could set priority to high, that'd be fine. There's no reason to, above normal will be over everything else as it is.
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post #19 of 19
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Quote:
Originally Posted by Belial View Post

By the way, when I said this, over the last week, I've actually been lowering an overclock, yet the failures have been occuring earlier and earlier. Just to make clear, failing later and later in prime95 is not, in and of itself, a sign of more stability, nor is being able to pass 12 hours of prime95 mean anything. I had an overclock on one run fail at the 19th hour, then I considerably lowered the overclock and failed at 3 hours. You have to test for at least 24 hours for stability.

Now if you, say, increase vcore and go from failing p95 from instantly to 6 hours to 15 hours, that's a good sign you're on the right track, but it's just as possible to fail 13 hours the next time you test if it isn't enough voltage.
Eh. Sure. To keep it simple, sure. I think you can figure out on your own exactly what happens when changing the priority of prime95 and what implications that has.
More is better, just make sure you don't write to disc. It'd depend how much your available ram fluctuates. I think there's a way to make sure that your system isn't writing to disc, by going into task manager, resource monitor, disc. Just make sure your HDD light isn't blinking more than when prime95 isn't running (it'll be obvious, and when p95 isn't running there's always a little activity so just a bit of blipping isn't bad).
In Task manager, it'll come up as normal. In reality, priority goes on a scale of like, 1-20 i think? I'm not exactly sure on the particulars, but 2 programs coming up as normal in task manager does not mean they have the same priority. Are you sure you tested prime95 on it's default worker window of 1 though?

You could set priority to high, that'd be fine. There's no reason to, above normal will be over everything else as it is.

Got it thanks.

I just set the priority of Prime95 to 10 and be done with it. My last question would be if you check the SUM (INPUTS) error checking and round off checking under the Advanced Menu of Prime95 when torture testing?
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