To sum up with ABT on all cores boost to 5.1GHz in my system with Custom dual rad EK loop. With ABT off all cores boost to 4.8GHz. I quickly benched a game (fairly demanding at 1440p) Ghost Recon - Breakpoint. I ran the in-game benchmark, with both ABT on and off. Interesting results, and temps were 18-20oC cooler for CPU with ABT off! Full system power draw was around 520W.
ABT on:
ABT off:
Dropping ABT can’t have lowered the CPU power use by 280 watts so it must have bottlenecked the graphics rendering performance too. Very interesting, are Nvidia using ABT on the Intel CPU for something?