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GTX 470 OC Question

post #1 of 20
Thread Starter 
Hi,

EVGA Precision and MSI Afterburner both say that the GTX 400 series have the core and shader clocks linked permanently. My question is, how would I go about overclocking the card? I was reading a thread about shader straps. What are the straps for a gtx 470? Would I OC by just increasing the shader which would also move the core until the next strap?

Any help would be greatly appreciated.
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post #2 of 20
I usually just raise the Core Clock 10-15MHz, then run OCCT for a few minutes then raise it another 10-15MHz. If it begins producing errors in OCCT, I then just lower it 5-7MHz until its stable again then raise the voltage up one interval. It takes time but can ensure stability.
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post #3 of 20
Crank it up to 1.087mv and 800mhz core. Test. If stable, see how low you can drop the voltage while maintaining stability. Repeat in desired increments of mhz.
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post #4 of 20
Thread Starter 
What about shader straps?
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post #5 of 20
The GTX400 series abandoned Shader straps. The shaders run permanently at 2x the core speed whereas with the cards before them, you could change this multiplier.
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post #6 of 20
Quote:
Originally Posted by matrices View Post
Crank it up to 1.087mv and 800mhz core. Test. If stable, see how low you can drop the voltage while maintaining stability. Repeat in desired increments of mhz.
You can manage 825-850mhz on the core at that voltage. You'll be running a stock 480 by that point too.
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post #7 of 20
Quote:
Originally Posted by xxbassplayerxx View Post
The GTX400 series abandoned Shader straps. The shaders run permanently at 2x the core speed whereas with the cards before them, you could change this multiplier.
^This.

This is done in order to preserve stability. I for one prefer to change the core/shader individually, but sadly the 4XX series do not allow that.
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post #8 of 20
Unlike with G80 thru GT200 cores, there does not appear to be any shader (or core, or memory) straps on Fermi. IOW, each of the domains seems to run at the exact clock you set it at, at least according to all the clock graphing tools out there like precision and AB.

And the shader domain clock will always be locked at 2x the core domain clock, and this synchronization cannot be defeated like it could on G80-GT200 cores.

Thus, depending on the OC tool you use, you will adjust either the core or shader domain clock, and the other will always move along with it, maintaining that same ratio.
Edited by brettjv - 1/7/11 at 11:58pm
    
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post #9 of 20
Thread Starter 
Thank you all for your answers. It appears right now with stock volts I have the core at 730 and the shader at 1460. I tested it with 15 min Furmark, 5 min ATITool artifact test, 3dmark11 and 3dmark06 and have not had an artifact yet. Also, does anyone know what the max safe voltage is for the GTX 470?
Edited by blue_k - 1/8/11 at 1:19am
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post #10 of 20
Thread Starter 
Does anyone know the max safe volts for the gtx 470? I can set it all the way to 1.14375 in EVGA E-LEET is this safe?. Or is 1.0875 the max I should go?
Edited by blue_k - 1/8/11 at 12:30pm
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