1st for decode.
2nd for encode.
3rd for the os.
others for other apps you want to run.
So for now you see that 3 or more cores is pretty sweet.
Is there any free video converter that will utilize all 4 of a quad core processor threads (cores) or at least more than one? I am thinking about getting a Q6600, but if the extra two cores don't help much, I might just get an E8400.