Newegg has two different 4000+ processors for sale, one is the clawhammer (0.13 µm) and the other is the san diego (90nm). The clawhammer is more expensive and as far as I can tell the only difference other than the power consumption(the san diego uses less at 1.35v) is the process type. Can anyone explain the different process types and what makes one faster than the other? I am building a gaming computer and am planning on using the 4000+ or maybe an x2. Any advice would be appreciated.