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When does a OC'd 570 = a Stock 580?

post #1 of 55
Thread Starter 
At what clock speeds does the 570 "match" the 580. These cards are similar and I was wondering at what overclock does the 570 match a stock 580? I know that the 570 can't make up the cores that the 580 has, but still, this info is relevant to my interests.
post #2 of 55
Somewhere around right after where the VRMS fail.
Kidding.

You would probably have to run it up pretty high. Like, Water cooling only high.
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post #3 of 55
Judging by gpuz screen shots pixel fillrate and texture fillrate (can I use the fillrates as an example?) around 850+ core clock?
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post #4 of 55
I think a 570 at 900-950MHz is getting mighty close to a stock 580...
post #5 of 55
Quote:
Originally Posted by Majin SSJ Eric;14277296 
I think a 570 at 900-950MHz is getting mighty close to a stock 580...

No way. I am pretty sure it only takes around 850Mhz core on the 570 to equal a 580. My 570 at 950Mhz core was spanking 580s in 3DMark 11.
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post #6 of 55
865ish, thats what it was taking me when I had a 570.
 
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post #7 of 55
Quote:
Originally Posted by Coolio831;14277284 
Judging by gpuz screen shots pixel fillrate and texture fillrate (can I use the fillrates as an example?) around 850+ core clock?

IDK if that really tells the whole story since shaders (CUDA cores) and memory bandwidth don't factor into fillrates. But for the sake of guesstimating biggrin.gif...

Pixel Fillrate = #ROP units x Core Clock

Texture Fillrate = #Texture Units x Core Clock


A stock 580 has a core clock of 772MHz, 48 ROPs and 64 TUs. So, it's stock pixel and texture fillrates are:
48 x 772 = 37056 or ~37.1 G.Pixel/s
64 x 772 = 49408 or ~49.4 G.Texel/s
Nvidia-GTX-580-Overclocking-Guide-7.jpg


A GTX 570 has 40 ROPs and 60 Texture Units, so to match the 580's pixel/texture fill rate you'd need core clocks equal to:
40x=37056, x = 926.4 MHz
60x=49408, x = 823.467 MHz respectively.

What does that mean? Well, apparently that the 570 should match/exceed the stock 580's raw power somewhere between 823 and 926 MHz core...

For example, @874.5 (the mid point between the two), the 570 should have a pixel fillrate of ~35 G.Pixels/s (~4% slower than the 580) but a texture fillrate of 52.5 G.Texels/s which is already ~6% faster than the stock 580's.

Again though, that's not factoring in memory bandwidth, tessellation rendering or CUDA cores so it's not exact.
post #8 of 55
My 570 is usually in a 10% or less range of most mild 580s I see on youtube , so 900 mhz .

Here I show faster speeds than 580 .

http://www.overclock.net/nvidia/1064915-gtx-580-low-unigine-benchmarking-score-2.html
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post #9 of 55
A GTX570 @ 850 core matches a stock GTX580 going by benches.

I've owned both a 570 and 580 before.
    
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post #10 of 55
Thread Starter 
awesome! im at 850mhz core 1700mhz shader 2000mhz memory. i've been running msi kombuster for 30 min so far no crashes. not sure if i should push farther, load= 45c. on second thought this is ocn!

at what point do i need to start altering voltages?
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