Attached Link: http://pclt.cis.yale.edu/pclt/PCHW/Hyperthreading.htm

64 bits means more RAM can be easily addressed. This is important if your doing something RAM hungry like graphics; you have a 64 bit version of the OS *and* the application. Also anything doing number crunching, like graphics and databases, could run faster, again if it's a 64 bit application. Windows supports "threads." This allows a single Intel/AMD CPU to appear to be doing multiple things at once. In other words you can cruise the web while rendering. While your PC can do two things at once, a single application has to be written in a special way to support multiple threads. You can write a computer game to use multiple threads, but most games are not written this way yet. I'm guessing Poser is also single-threaded; I think when you're rendering you can't do anything else in Poser. A multi-threaded application is Microsoft Word. For instance, it can save a file in the background, print and spell-check at the same time. Intel has pretty much topped out how fast a single CPU can run. One of the factors is the unbelievable amounts of heat some new chips generate. So the solution is to pack more CPU's into one package. In the past (2004), Intel introduced "hyper-threading" on their CPU's to give the appearance of multiple CPU's. They're moving toward "multi-core" which real mulitple CPU's. I'm guessing that "multi-core" CPU's will be a big part of the PC scene, for the next few years anyway.