Anandtech:
In testing to date we have not found any noticeable differences between the C1 and C2 stepping on our ASUS P5B-E motherboard samples. We did notice a very minimal improvement in the synthetic benchmarks but our application and game tests ended in a tie. The C1 stepping actually overclocked a little better than our C2 stepping but we cannot call a 1 FSB and 8MHz improvement in CPU clock a real advantage...
http://www.anandtech.com/cpuchipsets...spx?i=2851&p=3

Doufam, že gigabyte přidá i jiné změny než jen výměnu chipsetu, protože to vypadá na úplně stejný výkon i OC .