Changing GPU - But which will be better?

Hello,

i just wondered about the GPU list: http://setiathome.berkeley.edu/gpu_list.php

For example: The GTX 570 is better than an GTX 580. But WHY??
The GTX 570 got 480 CUDA Cores. The GTX 580 got 512?
Can somebody explain on which detail i have to look for?
Which constellation on a GPU is needed that it will work fast?
Cuda Cores / Graphics Clock / Processor Clock ... etc.

Hope to get an answer soon!
Thanks for helping me so far!
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Not saying I am an expert, but it looks like the GPU list is outdated since it doesn't have any of the new Kepler GPU's. Generally, the more CUDA cores a GPU has, the more work it can do. So, the GTX580 will perform marginally better than the GTX 570. Also, memory bandwidth can make some small but measurable difference so a card with a 384 or 256 bit memory bus will outperform a GPU with only a 192 or 128 bit bus. Clocking a card higher in graphics or memory always means it will do more work in a given period. So choose the highest clocked card you can get and still live with the noise, heat and instability. The newer card families all use less power than previous so less heat and noise. Also, the newer cards have optimized CUDA drivers and applications so they process more work than previous cards using lesser drivers and applications. Use of an optimized client will often net a better performance enhancement using an older card technology than getting a newer GPU using the stock applications. For Nvidia cards, the newest Kepler family of cards is performing better than the GTX 570 or 580 when using the optimized clients. They also use less energy. The Kepler family of GPU's do have a big performance hit with other projects like MilkyWay@Home which needs double precision math as Kepler only does 1/24 FPU work versus the older Fermi family which does 1/8 FPU work. They do make up some performance lost in the FPU work in their sheer much higher clocking. So, pick a price point you can live with and get a new card for Seti@Home or look for an older GTX 570 or GTX580 if you need real good double precision math performance for other projects.

Cheers, Keith

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Thanks guys for your help!
I'm working as an IT specialist. But in this case i don't know what's best for SETI@Home. Because i was not sure on which detail i had to look for.
The Cuda Cores or the clock speed or anything else...

Thanks again!
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I like to make some comments.
The 6xx series has a lot more cudas, but more isn't always better.
6xx series is more power efficient,that's a good thing.
But the cuda cores are a lot lot less powerful.

As you can see some 5xx cards outperform the 6xx series.
But I expect there will be some gain in optimizing for the 6xx series

Has anyone any experience with an EVGA GTX560 Superclocked of one of two types, the 02G-P3-1469-KR or the 02G-P3-2069-KB?
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