Translation is very poor, but I call ******** already on one point alone. Assassin's Creed 4 is single threaded and does not utilize HT or other cores. On a stock clocked 3.3GHz SB-E processor and a slower 680 vs their 780 maxed out I get more performance. Giving the PC more cores will not automatically give super performance. Even in games that actually "utilize" more cores (utilize used loosely) there is minimal performance drop going from 6, to 4, to 2 cores with or without HT. I actually demonstrate this in my guide with an Nvidia card. Like I said before, a graphics driver cannot automatically reprogram a game to utilize more threads. Not to mention, the 290x is faster than the 780 in basically everything. They should not be getting similar performance in any game, let alone less performance.
They also don't directly compare 2 and 4 core performance differences with like clock speeds. Another thing not done here is, in BF4 they could have also shown Mantle differences between using 2 and 4 high and low clocked cores.