Nokia Lumia 520 vs Nokia Lumia 620

Nokia Lumia 520 have 37.78% smaller semiconductor size/newer CPU than 620, also 2.05% less body volume. Lumia 520 also 3 g lighter and 1.1 mm thinner than Lumia 620. But 620 have 246 ppi when 520 have 233 ppi of higher pixel density (5.58% higher).