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RE: Controlling DP and HDMI port settings on Precision 7720?

You wouldn't need to do anything special for highest possible frame rates except maybe configuring the drivers to force the game application to use the discrete GPU if that doesn't happen automatically (although it usually does), but if you want VR and 90 Hz, you'd definitely need to enable "Graphics Special Mode" so the discrete GPU directly controls the outputs since the integrated GPU does not support that.

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