If you look at Intel website comparing the leading processors, Pentium Dual-Core and Celeron found on budget laptops are sadly missing. Laptops with either Pentium Dual-Core or Celeron are suitable as desktop replacement running Windows Vista. You don't need the Enhanced Intel SpeedStep Technology which the other processors offer since the laptops will be used as desktops. So, what are the differences between the budget processors?
Pentium Dual-Core has two processors which in actual fact may not be utilized by most software applications. They may have different clock speed, L2 cache and Front Side Bus speed but both support Intel 64 and Execute Disable Bit. You can choose one with at least 1GHz and mobile Intel 945PM/945GM/945GMS and 943/940GML Express Chipset using 512MB of system memory or greater to support Vista.