Reducing bugs reduces the heat, reducing the heat increases overclocking ability. The original 920's (CO stepping) could only reach 4ghz at 1.4-1.5v core or higher the newer 920 with D0 stepping can reach 4ghz with a lower 1.25-1.3v depending on each persons CPU, allowing for expansion in the overclocking of the cpu or at very least increasing stability of the cpu. I owned both 920's as my first 920 (C0 stepping) burnt had problems and got replaced by a newer D0 stepping 920.
I'd imagine with release of the latest 930 it's ability to be overclocked will be even higher.
I'd imagine with release of the latest 930 it's ability to be overclocked will be even higher.