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I've been in the monitor business for a long time. PWM is precisely a cheap and crappy way to dim an LCD screen. Why do you think so many manufacturers are now touting PWM/Flicker free monitors? Direct DC control and steady voltage changes is a far better method, but costs more. People go to...

I'm not sure how something more powerful, with more transistors and much beefier GPU would use less power. Barring a device design error.

Pretty silly question, of course the i5 will have better battery life than the i7.

To help, this is what the difference would look like. Stationary (notice line on right): Moving without PWM: Moving with PWM:

Does anyone know if the new SP4 uses pulse width modulation (PWM) to dim the screen? This can cause eye-strain for some people like me. PWM is a cheap/crappy way to control the brightness of a display. You can do a test here: Blur Busters UFO Motion Tests Focus on the moving vertical lines...