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Hybrid Optimus vs Optimus


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I have a recently acquired Lenovo W520 notebook with Quadro 1000M discrete graphics and Intel integrated. In various discussions, I see the Lenovo T410/T420 can drive as many as 4 external monitors but the W520 cannot (2 only). The difference is that the T420 has Hybrid Optimus where the W520 is just Optimus. Is Hybrid Optimus a function of the hardware, device drivers or both.

Thanks in advance for any light / references you can shed on this topic.

Edited by bobrharris
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What is hybrid optimus? Optimus with switch override?

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