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The question really describes that all. Here's a detailed disambuagation of my question:

  1. Can I combine a GTX 570 Sonic Platinum Edition and a 'Normal' GTX 570?
  2. If yes, then does it requires special configuration?; If no, then does it requires to be the same as my existing GTX 570 Sonic Platinum Edition?
  3. If yes (again) what is the equivalent card if I combine the 2? I want to know the equivalent if:
    • 1 GTX 570 Sonic Platinum + 1 GTX 570
    • 2 GTX 570 Sonic Platinum
    • 2 GTX 570
0

According to Nvidia, there should be no issue with this configuration. This is on Nvidia's FAQ page (NVIDIA FAQ Page)

Can I mix and match graphics cards from different manufacturers?

Using 180 or later graphics drivers, NVIDIA graphics cards from different manufacturers can be used together in an SLI configuration. For example, a GeForce XXXGT from manufacturer ABC can be matched with a GeForce XXXGT from manufacturer XYZ.

Can I mix and match graphics cards if one of them is overclocked by the manufacturer?

Yes. A GeForce XXXX GTX that is overclocked can be mixed with a standard clocked GeForce XXXX GTX.

As far as the performance of an SLI configuration, I've linked below two websites that have run a similar configuration and you can see relative performance there.

Guru 3D SLI Review

XBit Labs SLI Review

In tandem with that, an GTX570 SLI configuration performs roughly on par with a GTX 780 at its very best, and has singular GTX570 numbers at its worst. Your mileage will vary.

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  • performs roughly on par with a GTX 780 at its very best does that mean that it is better if I am going to buy another GTX 570 and configure it in SLI than to buy a GTX 780? Sep 23 '13 at 7:22
  • It honestly depends on your budget, your other computer specs (does your motherboard support SLI?, do you have adequate PCI-E outputs?, do you have enough power?, can your computer case take the extra thermal heat?). If the following are all "Yes" and you're limited to another 570, I'd take the leap if you find your gaming experience lacking. Otherwise, if you've got a little wiggle room take a look at a GTX 760 or a 770. Either provide a considerable increase in performance, noise, etc.. The GTX 760 around 66% alone Sep 23 '13 at 7:32
  • and the 770 around 75%. You can then sell your card locally and recoup some of the cost. Sep 23 '13 at 7:36
  • do I need to post my complete system specs? Sep 23 '13 at 7:40
  • Lets say I have an AMD Phenom II X3 @ 3.2 Ghz, 4GB RAM, motherboard that supports SLI, and a 500watts(branded/true power) PSU. Sep 23 '13 at 7:47

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