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So I have 2 NVIDIA GeForce GT 650M inside my notebook. I got SLI enabled in the NVIDIA Control Panel, however I suspect, from the external heat of my machine, that only one of them is used. I downloaded HWMonitor, to be sure of this. It seems that I was right, is it broken or I just missed something out of my sight?

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Can you provide us with the model of the notebook? –  Ramhound Jun 29 '13 at 12:16
    
Sure! It's a Lenovo Y500 model, if this helps. –  Sphery Jun 29 '13 at 14:19
    
You are positive it had dual graphic cards? Just because your laptop is cool doesn't mean hardware isn't being used. You can post a dxdiag log? –  Ramhound Jun 29 '13 at 22:40
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In Nvidia's drivers there is an SLI visual indicator (or at least there used to be).

Also, another option is to try some of the GPU vendor tools, like precisionx.

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