WINXP is one operating system that support HT technology.
For motherboard that support HT, the bios will read 2 processor instead of one during POST. And RDRAM really bring out that performance in ur 3.06ghz. Althought DDR is the cheaper alternative, it does not fully utilise ur machine. Actually, the new PIV 3.06 HT is meant for pple who do a lot of video editing and graphics renderings. That way, you are utilising the CPU, otherwise, its nothing more than driving a Ferrari in Singapore.