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post #1921 of 3582
Quote:
Originally Posted by i7monkey View Post
Is it just Furmark that can kill GPUs? I was about to run EVGA OC Scanner overnight (8+ hours) to check for stability, will that be bad for my GPU too?

+rep by the way
I think that's over kill, too many hours stressed. The best stability test is yourself behind a game like BF3 Beta, Crysis, COD, etc...

The most I've run any stress test was 1 hour. To me benching is more about getting through the bench without crashing. 3DMark11 has been a good way to get a base idea.

If your going in at smaller 15Mhz increments you'll know when you've hit the ceiling. Then back down a notch and your at your GPU's best OC. Can try to bump voltage for higher core possibility but I wouldn't try over 1.100v myself. I've read 1.200v is ok as well with our cards. Other non-reference cards can handle more, but on mine I'm leary.

That's my opnion, I'm not the best OC'er as I'm GPU worried, where others on here throw it in the fire and test it out. The EVGA GTX 580 maxed on air is average @950Mhz core.

And natrually you've got FTW420 who IMO is crazy good under water.
     
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post #1922 of 3582
Sometimes I think it's throttling from 99% load to 96% and the temp goes down 3-5C. Does that mean it's an unstable overclock? Does it always have to be running at 99%?
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post #1923 of 3582
I've already mentioned to you that things like OC scanner or Furmark will not actually be testing your cards how you want them to be tested. The OCP on your card (and I'm not mistaken here, whether you believe me or not the EVGA SC does have OCP) will throttle the clocks down when it detects those programs. Whatever information you are trying to find out, be it stability, temperatures, or power draw, will all be flawed by the fact that half of the time your core clock will be at 405Mhz. That is not a stability test, period. I've already mentioned that I like Unigine Heaven as I've found it to be more stressful than 3DMark11 but if you want to use 3DMark11 that is atleast not a useless test as Furmark or OC Scanner are. In addition to whatever quick stability tests you use, like Unigine, be sure to run the most stressful games you own for a few hours as well. If you can pass 45 minutes of Unigine and a few hours of stressful games, like Crysis, then I would call that pretty stable.

You are doing well to keep your memory stock while OCing your core, this way you can keep variables for instability as low as possible.

Quote:
Originally Posted by Arizonian View Post
Can try to bump voltage for higher core possibility but I wouldn't try over 1.100v myself. I've read 1.200v is ok as well with our cards. Other non-reference cards can handle more, but on mine I'm leary.
I would not get near 1.2v on the reference cooler. You are right that the most that is easily recommended on the reference cooler is 1.1v, but i7 after you've gotten a little more familiar with your card and how it responds temperature wise to voltage increases you can try going higher. I think around 1.125v is probably the most I personally would use for just a regular 24/7 OC for gaming but with the fan maxed you would probably be okay as high as 1.15 for short amounts of time.
Edited by juano - 10/6/11 at 11:45pm
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post #1924 of 3582
Quote:
Originally Posted by juano View Post
I've already mentioned to you that things like OC scanner or Furmark will not actually be testing your cards how you want them to be tested. The OCP on your card (and I'm not mistaken here, whether you believe me or not the EVGA SC does have OCP) will throttle the clocks down when it detects those programs. Whatever information you are trying to find out, be it stability, temperatures, or power draw, will all be flawed by the fact that half of the time your core clock will be at 405Mhz. That is not a stability test, period. I've already mentioned that I like Unigine Heaven as I've found it to be more stressful than 3DMark11 but if you want to use 3DMark11 that is atleast not a useless test as Furmark or OC Scanner are. In addition to whatever quick stability tests you use, like Unigine, be sure to run the most stressful games you own for a few hours as well. If you can pass 45 minutes of Unigine and a few hours of stressful games, like Crysis, then I would call that pretty stable.

You are doing well to keep your memory stock while OCing your core, this way you can keep variables for instability as low as possible.
+rep.


Question though. How do we test for artifacts since it's very hard to notice (I'm talking a few pixels here)? Will unseen artifacts cause damage to my GPU? As in, what if I run Unigine and a few games and it doesn't crash, but it has artifacts that I don't notice, is that bad?
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post #1925 of 3582
Quote:
Originally Posted by i7monkey View Post
+rep.


Question though. How do we test for artifacts since it's very hard to notice (I'm talking a few pixels here)? Will unseen artifacts cause damage to my GPU? As in, what if I run Unigine and a few games and it doesn't crash, but it has artifacts that I don't notice, is that bad?
Just watch it for 30-45 minutes. You'll notice the artifacts if they show up. And usually when you get one or two, you'll get a lot more anyway.

Also, remember....
If you DO get artifacts, you'll need to restart your computer to completely get rid of them. You can't just back the clocks back down, you will have to restart.
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post #1926 of 3582
Thx guys
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post #1927 of 3582
Well I've heard one 'maybe' that a really high memory OC has caused a card failure. But this was a really high OC, one that he ought to have known wasn't stable, I want to say around 2500Mhz. I'm not even completely sold that it was cause by the high OC, but if it was I would say that it was due to the VRAM constantly trying to correct itself with it's error correcting code (ECC) which would try to hide errors at the cost of performance, but that isn't present in the GPU core. I don't have enough information and confidence to say completely 100% that artifacts will not damage your card but I can say I've not seen or heard of it happening, so I personally am not worried about it.

As for being able to see the artifacts, there will very rarily be just one artifact for a split second. If there is one there will be more eventually, that doesn't mean it takes hundreds all at once for you to call it unstable but if you think you see one, then you will see it again eventually. In Unigine the artifacts are pretty easy to see, the most common one I've come across are realy big rays of colored light, which you will not miss if you see them. Also Unigine is good in that it will often be so stressful that it will completely crash on a unstable OC. So basically if after 45 minutes of running, and I would intently watch it for about 15 minutes of that time probably 5 minutes beginning middle and end, you don't see any artifacts then you are likely stable in Unigine. If you are failing Unigine it's not alll that difficult to see.

Pio oh well I learned something, I didn't know to restart after seeing artifacts. I knew to restart if your OC fails and goes down to 405Mhz (you have to reboot to get your clocks back up) but didn't know to do so for artifacts as well.
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post #1928 of 3582
For stability tests I run 3DMark11, play my normal slew of games, and F@H. If it can do those without crashing then it's stable.
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post #1929 of 3582
Yes, I agree with all of those HWI. I don't want to spam folding too much in here, but if anybody wants to look into using their machine to fold I'd love to help set it up or answer questions/address concerns or anything else I can do to help people in here fold. For those that might need a quick description of folding, it is a distributed computing project that looks at how proteins fold and mis-fold themselves. This information is useful in that it provides data that scientists use to continue working on possible cures and/or further their understanding that will lead to cures for diseases such as cancer, Alzheimer's and many more. It's a great way to get the most of out the super powerful hardware that many of us have in here.

Also to sweeten the pot a little bit, I can help people set up the GPU client to get work units that are the toughest most stressful things I've ever run on a GPU. If you ever want to really find out if your OC is stable, or want to see what your max temperatures can be then this is it. I haven't run them back to back with Furmark on a card without OCP but I honestly think they are as stressful or possible even more stressful than Furmark. Feel free to PM me with any questions or if you'd like help setting it up. More information can also be found in the essential folding threads link in my signature.
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post #1930 of 3582
Hoping for some advise, I'm stuck at 960 @ core and when trying to push 965 (with any memory clock or volts) it will BSOD with 116 code in Graphic Test 4 without fail. This is with SLI.

0x116 = Low IOH (NB) voltage, GPU issue (most common when running multi-GPU/overclocking GPU)

That's the advise on the error code, but raising VCCIO (tried up to 1.175v) doesn't change anything. Went back to stock CPU / RAM settings and it still happens without fail. I can raise CPU volts + clocks and it's a non-issue but as we're chasing GPU score here.. have I hit the limit or is it my parts? I'd accept it if it complained about driver falling over etc, but this 116 is a PITA.
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