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You shouldn't since MP will use 50 Hz on both those formats hence DRR will not change refresh rate.

DRR still makes sense because deinterlacing will only convert 25i to "50p" but you still need to set the display to 50 Hz.

This is the same issue I had when using Windows 7 and a single graphics card except my video wasn't smooth. However using two different graphics cards or Windows 8 helped. Seems you already use MP on a separate graphics card so I don't know what's going on, sorry.