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Overclocking 2 GTX 580 Classified Ultras

post #1 of 39
Thread Starter 
So I want to start overclocking my GPUs. What should I set the core and memory clocks to? Is EVGA Precision good to use? Do I have to set voltage too?
;)
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;)
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post #2 of 39
There are possibly hundreds of threads on this and similar issues. Have you tried searching the forums?
    
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post #3 of 39
Thread Starter 
There are questions I had to ask that I didn't think others did, so I made this thread. Can anyone help?
;)
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post #4 of 39
Quote:
Originally Posted by Jobesky View Post

There are questions I had to ask that I didn't think others did, so I made this thread. Can anyone help?

Sure ask away
post #5 of 39
Thread Starter 
1. What would be an ideal starting core clock increase for both cards?

2. Do I have to mess with voltage? if so, do I do that in BIOS?

3. In regards to above, if I mess with the voltage, will that affect my CPU overclock too? I OC'd my CPU earlier and I'm worried if I have to increase voltage that that will somehow affect my OC for my GPUs.

4. Is EVGA Precision the best way to OC the GPUs?

5. What kind of performance gains would I be seeing?

6. How do I know if it's stable or not? Artifacting, shutting down, etc.?
;)
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;)
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post #6 of 39
Thread Starter 
Bump. Anyone?
;)
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post #7 of 39
Quote:
Originally Posted by Jobesky View Post

1. What would be an ideal starting core clock increase for both cards?
2. Do I have to mess with voltage? if so, do I do that in BIOS?
3. In regards to above, if I mess with the voltage, will that affect my CPU overclock too? I OC'd my CPU earlier and I'm worried if I have to increase voltage that that will somehow affect my OC for my GPUs.
4. Is EVGA Precision the best way to OC the GPUs?
5. What kind of performance gains would I be seeing?
6. How do I know if it's stable or not? Artifacting, shutting down, etc.?

1. Start by adding 50mhz to the clocks with no voltage increase. After that move in 15-25mhz increments.

2. For GPUs you don't need to go into the bios, use EVGA's software or MSI afterburner to control the voltage and clocks.

3. It will not change your CPU overclock.

4. EVGA Precision or MSI afterburner, I pref afterburner.

5. Download Heaven HERE and watch it as it runs, when the program is open, there is a button to click that says "benchmark", this will track your progress in performance, and you should watch the runs for artifacts or if the device driver fails, restart and go down in mhz or up in voltage.

ALSO, make a custom fan profile for your cards so they aren't getting too hot. I would reccommend putting them at a minimum speed that you can't hear them, then scaling up ~70c to max fan speed at ~80-85c.
 
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post #8 of 39
1. What would be an ideal starting core clock increase for both cards?
-- I would go with an increase of 75-100MHz, then go from there. To fine tune it, make jumps of 10 - 15MHz.

2. Do I have to mess with voltage? if so, do I do that in BIOS?
-- I wouldn't touch the voltage unless you are under water, and know what you are doing. It's very easy to brick a card upping the volts without knowing what you are doing. However, you would do that in either EVGA Precision, or MSI Afterburner

3. In regards to above, if I mess with the voltage, will that affect my CPU overclock too? I OC'd my CPU earlier and I'm worried if I have to increase voltage that that will somehow affect my OC for my GPUs.
-- I would set your GPU and CPU to stock when you OC your cards. It's possible that your current CPU OC would not be stable once you start to OC and fine tune your GPUs. Once your GPUs are fine tuned, then go ahead and re-OC your CPU.
-- Increasing volts shouldn't mess with your CPU OC of any sort from what I'm aware of. It'll just put more stress on PSU, etc.

4. Is EVGA Precision the best way to OC the GPUs?
-- EVGA Precision, Precision X (newest version), or MSI Afterburner

5. What kind of performance gains would I be seeing?
-- Check any review site for their mild OC performance gains and you can judge from there.

6. How do I know if it's stable or not? Artifacting, shutting down, etc.?
-- Using any benchmark program, or EVGA OC Scammer or MSI Kombuster.
post #9 of 39
Thread Starter 
But when I loaded the optimized OC setting to 4.2ghz, my voltage was set to auto too. If I OC my GPUs, would I still have to set voltage even though it's already likely been auto increased?
;)
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post #10 of 39
Quote:
Originally Posted by Jobesky View Post

I meant that when I OC'd my CPU, my voltage was set to auto. Since it was set to auto, does that mean I wouldn't have to set voltage after I OC the GPUs since the CPU OC already did that?
Also, I did the one-click thing since, near as I can tell, there's alot of little things you have to do for an OC. I was just scared I was gonna break something.

There is no auto for GPU overclocking you have to manually adjust the voltage.

Chances are the "one click overclocking" is giving your cpu more voltage than it actually needs therefore hurting it even more.
Small wonder.
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Small wonder.
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