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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 682

post #6811 of 38704
Quote:
Originally Posted by Daffie82 View Post

Hi Guys
Seems my clocks of 1175 core and 1580 of memory for my sapphire HD7950 OC edition are not as stable as I thought...
Despite running benches in Heaven and Furmark I get ''driver not responding and has recovered'' after gaming for a while in Batman : AA
I am running at 1175 volt and default voltage for the memory.
What would you guys suggest? Just try running abit lower (lets say : 1150 core and 1550 memory) or upping the voltage a little more?
I am getting low 70 degrees in Furmark, low 60 degrees in Heaven at 1175 voltage.
Thanks for your advice !

You can raise the core some more but i would lower your memory speed or add some volts to the memory. Running the memory too far for too long is not advisable. At least with the core w when it crashes and you know you're absolute limit, but the memory could be artifacting the whole time and you wouldn't know it to the error correction algorithm.
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post #6812 of 38704
Quote:
Originally Posted by disintegratorx View Post

Donno Focus but you should make sure that you have plenty of power to run 2 of these cards. I don't even think I could run 2 of these on my 800 watt PSU.

Already sorted it.

Had my 7950 + 7970 both at 925/1375 up for a while now biggrin.gif

Running it on the Corsair TX650 V2 with no problems

Although I did have a low leakage 7970 with a stock volt of 1.050mv that i have undervolted to 1.018 so far. I have also undervolted my 7950 0.012mv so far

Hopefully i can push the volts a little lower and i'll probably run at 960/1375 or something.
post #6813 of 38704
Quote:
Originally Posted by tsm106 View Post

You can raise the core some more but i would lower your memory speed or add some volts to the memory. Running the memory too far for too long is not advisable. At least with the core w when it crashes and you know you're absolute limit, but the memory could be artifacting the whole time and you wouldn't know it to the error correction algorithm.

Thanks for the tip +rep thumb.gif

With ''you can raise the core some more'' you mean the core voltage I presume?

I will try first by upping the core voltage a bit to 1.181v or something and lowering the memory to 1550 (-30 mhz).
If that runs fine I can try putting the core voltage back to 1.175v and see if that holds up while gaming.
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post #6814 of 38704
Quote:
Originally Posted by Daffie82 View Post

Thanks for the tip +rep thumb.gif
With ''you can raise the core some more'' you mean the core voltage I presume?
I will try first by upping the core voltage a bit to 1.181v or something and lowering the memory to 1550 (-30 mhz).
If that runs fine I can try putting the core voltage back to 1.175v and see if that holds up while gaming.

I would drop both down by 15-20mhz. See if it's stable with heaven then work my way back up incrementally. It's important to go up one small jump at a time and test each step of the way.
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post #6815 of 38704
Quote:
Originally Posted by tsm106 View Post

I would drop both down by 15-20mhz. See if it's stable with heaven then work my way back up incrementally. It's important to go up one small jump at a time and test each step of the way.

Thats the problem, with heaven benches my clocks are stable.
Its after some heavy gaming with Batman : AA that I get the ''driver stopped responding'' error. Thats why your explanation of the ram speed made alot of sense to me (due to the error correction etc).
I will leave the voltage as it is and adapt the cores to 1150 / 1550 (-25mhz and -30mhz)
After that I can try upping one at a time slightly to see how high I can get.
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post #6816 of 38704
I just got my Diamond 7970
i have a few questions...
what program should i use to OC it?
what should be my max voltage?
what should be the max temps?
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post #6817 of 38704
^^Read the OP.
Quote:
Originally Posted by Daffie82 View Post

Thats the problem, with heaven benches my clocks are stable.
Its after some heavy gaming with Batman : AA that I get the ''driver stopped responding'' error. Thats why your explanation of the ram speed made alot of sense to me (due to the error correction etc).
I will leave the voltage as it is and adapt the cores to 1150 / 1550 (-25mhz and -30mhz)
After that I can try upping one at a time slightly to see how high I can get.

What I mean is when you move clocks up, do one at a time. You are looking for the point where memory clock returns start to shrink. For ex. if you move mem clock up 5 mhz and you get 5pts in return, then you go up 5mhz more and you get back 2pts in return. That shrinking return is a sign of error correction working. At that point I would drop mem clock down a little bit for margin.

Once you've found your sweet spot, then try a game etc.
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post #6818 of 38704
Can someone explain to me the top couple reasons for your card to never work again after overclocking? Nothing has happened to mine, I just want to know.
post #6819 of 38704
Quote:
Originally Posted by Hambone07si View Post

What up Levesque? Glad to hear someone having luck. I haven't tried them yet myself. Can you launch BF3? Do you use AB for overclocking and if yes, do you enable Unofficial Overclocking Mode?
Thanks,
Hambone

I'm not using Afterburner. Too much problems and bugs for now. My 4X 7970 are at 1150/1600 on stock voltage. Not worth the aggravation for 100 more on the cores. smile.gif

Probably the reason everything is working fine for me. Afterburner is not ready yet for the 7970 and AMD beta drivers... I'm still waiting a bit until Afterburner gets better and more stable before using it.

I never liked Afterburner anyway. Why can't AMD gives us voltage sliders and controls in CCC? It would be so much easier... rolleyes.gif

They could easily put this under an ''Advanced users'' tab or something.
Edited by Levesque - 3/21/12 at 8:59am
    
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post #6820 of 38704
Quote:
Originally Posted by igrease View Post

Can someone explain to me the top couple reasons for your card to never work again after overclocking? Nothing has happened to mine, I just want to know.

I would assume one of the biggest reason is people changing the voltages and blowing the capacitors. Other than that I don't think there is any other way of really breaking them. You change the volts, you risk killing the card.
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