I'd also like to know if this technology will be enough to run games like Half-Life 2 at max settings; and if it will last me more than a few years before becoming "outdated"/struggling to run the newer games.
I believe that Hybrid SLI works when you have a mobo that features integrated graphics.
Like zenmaster said - It uses your powerful GPU when you are doing graphics intensive work (games, video editing, etc). When you are not doing anything graphics intensive, it will shut down the GPU completely and use the motherboard's integrated graphics.
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