Aparently, there is a bug for running dual core processors in Windows XP envirnoment. Has anyone hear about this? Without this patch, you won't get the full performance of your dual core CPU:
Taken from Microsoft's website:
Computers that are equipped with multiple processors that support processor power management features, such as Advanced Configuration and Power Interface (ACPI) processor performance states, require Microsoft Windows XP Service Pack 2 (SP2). Additional updates are available to optimize performance and behavior on computers that are running Windows XP SP2. Without these updates, computers that are equipped with these power management-capable, mobile, dual-core processors
may experience decreased performance or unexpected behavior. "
So those of you that are running dual cores now, download this and install it.