For a dual core processor with 1.8GHz to equal 3.6GHz do i need Windows 64bit edition?

64-bit is practically for more ram. In Vista64 there are two program folders; one is Programs, one is Programs(86). The 86 is were all none 64bit things go. Each core runs at 1.8 multithreading between cores, but your speed is 1.8. This kind of is doubles your speed because of the load it can take, but your still really at 1.8, with lots of cache. The os is 64bit and multithreads. The program that your running will be multithreaded as one thread. Bottom line is more ram. You want the ram go 64. I did and nothing changed.- except more ram :)