" The headline PPA values that Samsung is announcing are also impressive: compared to 7nm, 3GAE will offer 1.35x performance, 0.5x power, with a 0.65x die area." ... Samsung states that these performance numbers are based on using larger width cells for critical paths where frequency is important, and smaller width cells for non-critical paths where power savings are crucial. Technically Fmax of the widest cells is listed as 1.5x, while power at Fmax is 0.6x. Power at iso-performance is where the 0.5x number comes from."

I don't think 35% at fixed frequency makes sense; 35% is the frequency boost (with power savings too).