So then, in conclusion as always, this is x-factor stuff, extreme, nearly silly stuff to do and show. But people out there do purchase setups like shown today. At least you now know the pros and cons. Our recommendation is simple, if you have the hots for a multi-GPU setup based on the GeForce GTX 580, we recommend a 2-way SLI setup at best. With 3-way you'll run into heaps of curiosities like power consumption, noise levels and then the CPU bottlenecks - that last one is just sheer dreadful.
Flipside of the coin, 3-way SLI can be really helpful with 3D Stereoscopic gaming and a triple monitor gaming setup. The drivers, as always, are done well, we did not have any issues significant enough to mention, so from NVIDIA's side it's all good. But on a single monitor we do think that the infrastructure and sheer cash needed outweighs the extra performance you'll get for it in return. But that doesn't mean it's not tremendously cool stuff to play around with though.
Oh and 4-way SLI you wonder? Worse... that's 2-3% performance increase if you are lucky, with 3DMark Vantage as the exception. So yeah, stick to 2-way SLI we say -- unless you need to break 3DMark records of course
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