1. I know Sempron chips have less cache. But Laptops with Sempron chips are about $200 cheaper than the other 2 AMD chips, for the same clock speed. Does anyone know how much impact does the less cache have on trading software? In other words, do trading software take advantage of extra cache of the more expensive chips? 2. Are all Sempron chips still 32-bit? Does 64-bit help trading software run faster? 3. Athlon vs. Turion, which one is faster (for the same clock speed)? Thanks!