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570 Overclock Unstable or Not?

post #1 of 10
Thread Starter 
I have an Asus GeForce GTX 570 DirectCU II card and am in the process of refining my overclock. I've got the voltage set to the maximum MSI Afterburner allows me, 1.125V (1125 mV) so my aim is to find the maximum clock speeds I can achieve with this voltage. Temperatures in games never go above the mid-50°C's so it's perfect. Stress testing with FurMark adds a couple of degrees but nothing beyond the low-60°C's.

Yesterday I lowered my memory to 2200 MHz instead of 2300 MHz because I was crashing on Deus Ex Human Revolution where the game would suddenly freeze and the screen would be peltered with groups of white and green dots in a sort of pattern, requiring a complete computer reset. I'm happy with 2200 MHz memory and haven't had this kind of crash since.

My issue is with the GPU. I've got it set to 860 MHz at the moment. Last night I started on 900 MHz and on Deus Ex Human Revolution, I was playing and suddenly the game froze for a second or two, the screen went black, I was sent to my desktop and the game was "Not Responding", requiring a force close.

To try to overcome this, I lowered my GPU clock speed in 10 MHz steps and retested. What annoys me is that 900 MHz was perfectly fine for an hour and a bit on both FurMark and Unigine Heaven!!
Anyway, every time I lowered the GPU clock speed by 10 MHz, I could play for longer before encountering a crash of this kind. I got down to 860 MHz and played for hours and hours yesterday and today, which seemed stable. Earlier however I took a break, started the game again and bang, just a while in and I get the same problem...

Is this an overclock instability or something else entirely?
Crysis 2 seemed fine with 860 MHz on the GPU and both FurMark and Unigine Heaven are perfectly fine even with 900 MHz on the GPU. I don't understand this...
    
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post #2 of 10
I have found that some game engines are more susceptible to overclock instability than other Engines or applications. In the end when I was overclocking my GPU's..I had to go for the happy Medium. I have found many times that what may be stable in Furmark or 3DMARK may not necessarily mean 100% stable across the board.
post #3 of 10
Basically what ENTERPRISE said. I had the same experience with DX:HR (the white/green pixel pattern). Bumped the voltage up a couple notches and it was fine after that.
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post #4 of 10
Quote:
Originally Posted by ENTERPRISE View Post
I have found that some game engines are more susceptible to overclock instability than other Engines or applications. In the end when I was overclocking my GPU's..I had to go for the happy Medium. I have found many times that what may be stable in Furmark or 3DMARK may not necessarily mean 100% stable across the board.
Pretty much what he said. OP you should try a few other games such as:
Bad Company 2, Crysis 1, Crysis 2, Battlefield 3 (when its out), Metro 2033, Witcher 2 are all good to try out.
    
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post #5 of 10
Thread Starter 
Quote:
Originally Posted by ENTERPRISE View Post
I have found that some game engines are more susceptible to overclock instability than other Engines or applications. In the end when I was overclocking my GPU's..I had to go for the happy Medium. I have found many times that what may be stable in Furmark or 3DMARK may not necessarily mean 100% stable across the board.
Agreed, my trouble is that I don't know what "happy medium" constitutes!

Quote:
Originally Posted by skinnysumo View Post
Basically what ENTERPRISE said. I had the same experience with DX:HR (the white/green pixel pattern). Bumped the voltage up a couple notches and it was fine after that.
Unfortunately my voltage is as high as it can go - 1125 mV. I pretty much fixed that problem though, having reduced my memory clock speed from 2300 MHz down to 2200 MHz. No more white/green pixel pattern crashing now. The issue is the GPU I believe, with the game freezing and the screen going black before being sent to the desktop with the game not responding.

Quote:
Originally Posted by Razi3l View Post
Pretty much what he said. OP you should try a few other games such as:
Bad Company 2, Crysis 1, Crysis 2, Battlefield 3 (when its out), Metro 2033, Witcher 2 are all good to try out.
I will indeed. I will install Crysis 2 in a while to test it out. Unfortunately Battlefield Bad Company 2 is a crash-fest even when nothing is overclocked - I have never seen that game stable on my computer, no matter the circumstances. Battlefield 3 should be a different story!
    
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post #6 of 10
I have found that lowering the memory OC in general with any GPU will give you more headroom with the actual GPU OC. When I have found my happy GPU OC, I will usually then start overclocking my memory. Once I have found a Happy OC with both, I tend to then down me memory OC by 100 or maybe even 200Mhz to give my card more breathing room with its final OC. I have found that by doing that, more application are happier with my OC in general. This is just me however.
post #7 of 10
Thread Starter 
Quote:
Originally Posted by ENTERPRISE View Post
I have found that lowering the memory OC in general with any GPU will give you more headroom with the actual GPU OC. When I have found my happy GPU OC, I will usually then start overclocking my memory. Once I have found a Happy OC with both, I tend to then down me memory OC by 100 or maybe even 200Mhz to give my card more breathing room with its final OC. I have found that by doing that, more application are happier with my OC in general. This is just me however.
That's interesting. Is that really the general case, that lowering the memory gives more headroom for the GPU?
    
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post #8 of 10
In general I have found that is the case with overclocking GPU's. I am not an architect of PCB's but it s the case in general that the higher you take the memory, the less headroom you give the GPU for overclocking, you will only get so far and then you will hit a wall of instability. Everytime that has happend..I have lowered the memory. At times I have been able to go further with the GPU OC or it has simply restored stability to the card and I have been able to keep the GPU at the OC that was previously causing issues. In general it is like playing with a seesaw so to speak. I would try keeping your GPU OC at what it is now ( Or whatever works in most apps ) and take your memory back to STOCK.

Once you memory is at stock, play the apps that caused you issues at your current GPU OC. IF there are still stability issues then it will and can only be your GPU OC, as such you need to back it down. If there are no issues at your current GPU OC then you know it must have been your RAM. As such you now know your maximum GPU OC and you can now see how far you can push that memory before you hit that will again, if you do hit that wall again, then back it off 100Mhz+ and you should have found your OC.

Remember though, GPU Overclocks yeild the better perfomance boosts. Overclocking your memory will onlt help so much and then...it becomes null and void and all you are doing is pushing yourself further and further towards instability with no particular performance gains.
post #9 of 10
Thread Starter 
Thanks very much for all this ENTERPRISE, I will give all this a go!
    
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post #10 of 10
Anytime Good luck !
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