On: Microsoft announces the Surface Pro 3

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Dell XPS 13: 13.3" @ 1920x1080 = 166 PPI

Asus Zenbook Prime: 13.3" @ 1920x1080 = 166 PPI

Lenovo Thinkpad Yoga: 12.5" @ 1920x1080 = 176 PPI

Lenovo Yoga 2 Pro: 13.3" @ 3200x1800 = 276 PPI