1-6 of 6 Answers The 7 series has lonely 3 HDMI ports and also only has 120 he . Series 8 has 4/HDMI ports plus it has 240 he, also for the difference in price has more features. In addition to what was already said, Series 8 has over twice the contrast as Series 7 - 7 million to 1 ration versus a 3 million to 1 ratio.