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Stress Testing Warning - Page 3

post #21 of 113
2 hour stress is never enough , i had this pc do 24 hour prime then fail in 2 mins of linx. I do 500 runs of linx on full memory then she is good, I fold on cpu and gpu 100% so 2 hours is not going to pass.

That goes for any overclock any pc. If not stable what good is it.
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post #22 of 113
Stability is a subjective matter. What is stable for one person may not be stable for another. As it is, OP, you don't really push your CPU. Likely you probably don't even need an overclock.

On a personal basis, I've had a hard drive crash from an unstable overclock. So just because your OS does not crash, it could be writing bad bits all over your drive. This will lead to OS corrupting, and worst case scenario, data loss.
post #23 of 113
Quote:
Originally Posted by blakmumba;13120663 
I seriously question the need for all this 24hr testing going on your brand new CPU, I see numerous cases here of guys bragging about their 24hr stress testing, or saying someones overclock is not stable because they haven't benched for 24 hrs.

How much experience have you had with overclocking? This attitude is generally reserved for amateur overclockers who have never had corrupted data.
Quote:
A stress test is running all of your CPU cores flat out for however long you run the test, unless of course a core drops out because your overclock is unstable, I see the need for short term testing say an hour or maybe 2, because it won't take that long for an unstable overclock to show itself, but 24hrs in my opinion is not necessary.

I think you are confused. The error is not found because the CPU is at 100%. A major error, or more likely, many tiny irrecoverable errors, happen at any % of CPU usage. The programs are designed to find inconsistencies as fast as possible, utilizing all resources available to determine the stability. Its not lets see how hard we can squeeze your CPU till it breaks. Is it stressful? Sure, is the stress that causes error? No, that would be instability or heat. Another good way to test your cooling solution too I might add.
Quote:
There is not a thing on this planet designed to last forever, your precious CPU included when companies like Intel and AMD, guarantee their CPUs for 3 yr warranty time period, they're confident their CPUs will actually go past that time period, however that calculation is based on 3 yrs and beyond of normal use.

They know their CPUs are capable of lasting under normal spec'd use longer than the 3 yrs or they would not warranty them that long.

Not sure why this is even here. This has nothing to do with stability testing, unless you are assuming that all CPUs that are brand new should not be tested @ stock settings? Which a CPU should be tested to ensure its not defective. Rare, but it can happen.
Quote:
Now the cold hard fact is that overclocking your CPU will shorten its lifespan, but we accept that for the additional speed we gain, most of us will replace that cpu with an upgrade before is life expectancy arrives anyway, so taking it out of specifications is acceptable.

Has nothing to do with stability testing. Its about error prevention.
Quote:
However that's with normal day to day use, surfing the web, audio and video editing and converting, gaming, office documentation Etc, and though serious bench stress testing is necessary to achieve a stable overclock, what damage does stress testing over a 24 hr time period and beyond, actually do to shorten the lifespan of your new CPU.

Why would you even overclock then?
Quote:
For example if you stress test your new quad core CPU for 24hrs, and all 4 cores are running at 100% for 24 hrs, how much normal daily processing is lost, because no daily application uses all 4 cores at 100% for 24hrs, so at least think about that when you overclock your CPU, and use at least some kind of wisdom in your stress testing.

Again its not the stress that creates the error, its stress that finds the error. Errors can occur with as little as 1% core usage. The alternative is to use your computer until one day, your boot sector is corrupted, and Windows 7 repair, can't fix the files as the damage has occurred widespread through your file-system. At this point you are even lucky to recover data off the hard drive. Assuming you are still not using an unstable overclock, recovering data, will most likely keep it corrupt/re-corrupt it.
Quote:
Because if you don't think you're adding to shortening the life of your CPU, you're wrong!

Stress testing your CPU, if its adequately cooled, is not shortening your hardwares life, its the extra voltage/clock cycles from the overclock if anything. It sounds like you have a ton still to learn / grasp and thats okay. Overclocking has many useful applications, such as a technical server upgrade, gaming, scientific calculations, protein folding, etc. Many of those demand stability for personal and professional reasons. Folding requires 100% accurate data, or its wasteful time for both the user and server, which anyday can provide a cure to cancer (hopefully.) A non tested overclock in that field is extremely frowned upon by many people who dedicate entire machines to just folding.

I am not saying you have to stress test your CPU, or it will die and kill everything in your computer, but you are not going to convince anyone who knows what they are doing that its a waste of time.

I don't get why people are ever against having a fully stable system? It takes about a day if you actually have good settings. Maybe apathy or general laziness, but still, it will create so many headaches in the long run trying to figure out why the computer just doesn't want to work today.
Edited by RagingCain - 4/14/11 at 2:19pm
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post #24 of 113
I have done 12 hours of prime and 50 runs of IBT and had an OC fail 2 days into folding...
post #25 of 113
well i stress tested my pc for 18hrs with prime and i havnt had it crash on me yet and i have been folding 24/7 for the last 2weeks, the occasional stop to play a game here n there, but been folding while playin d2 lately and it has been fine
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post #26 of 113
I find this funny.

Stress test takes away CPU life? Lets go back to my 3700+ Clawhammer. That thing is NO good at overclocking. Stock was 2.4 GHz, absolute max I could go with an XP-120 cooler was 2.65 GHz. That was with a load temp of 39C it was just EATING the volts.

That CPU ran at 100% usage most of its life. If it wasn't doing prime95, it was running seti@home; games pushed it to 100% all the time; it would do video encodes for literally weeks at a time because it was so darned slow at it (3 fps anyone?). Guess what - that CPU is just as stable now as the day I bought it 5 years ago, and at the same voltage! How you ask?

Because I stress tested it.

An unstable overclock is the fastest way to kill a processor barring pulling the heatsink off and cooking it in linpack. Don't believe me? Ask intel. They have enough doctorates to wallpaper Buckingham Palace and this is their position. In their words, "the signal lanes must be clear."

I worked on a computer about the same age when it was built and it was given a 5% overclock. Not much. Unfortunately, we didn't stress test it until it was too late. Guess what - even with the time in CnQ when it won't degrade, that CPU became totally unstable at stock speeds in two years of light use.

So as for the mega rant... LOL, but no.
Edited by Iroh - 4/14/11 at 3:01pm
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post #27 of 113
-noob at overclocking
-has no clue what prime is even testing
-uses the warranty period to gauge how long intel thinks their cpu's will last
-tells plenty of vetted overclockers that they're wrong

+REP
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post #28 of 113
God left OCN a long time ago...

You're making a lot of unfounded claims. You can't say something like :
Quote:
Originally Posted by blakmumba;13120663 
A stress test is running all of your CPU cores flat out for however long you run the test, unless of course a core drops out because your overclock is unstable, I see the need for short term testing say an hour or maybe 2, because it won't take that long for an unstable overclock to show itself, but 24hrs in my opinion is not necessary.

and expect people to think you aren't new. There are people who run their tests for 24 hours, 48 hours, a week, whatever it is. Since these tests CAN fail 8+ hours in, it's obvious you want to run them as long as possible.

What causes a processor to degrade comes from misuse (high voltages, or inadequate cooling). Running your processor at full load for extended periods may have an impact, but is totally negligible (if you don't blow your VRMs or PS).

There are a number of different tests to run, some that fail quicker than others.
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post #29 of 113
All the 12 year old's in the house say 'wayoo'....
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post #30 of 113
Lol, this post reminds me of my buddy who stress tests for an hour and wonders why be bluescreens all the time.

Move along here everyone, let him be he's obviously made up his mind.
Enjoy the crashes! smile.gif
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