Fernando,
Are you on a desktop, or a laptop? Desktops are much better, because all of that activity generates a lot of heat (which kills components). Desktops do much better with heat, but some guys need a laptop because they have to take the computer with them when they shoot. I do that sometimes also, but when I can I use the desktop.
If you have a desktop you should have room for more internal hard drives. If you have a laptop you may have room for one more internal drive, or you may not.
The thing is that H.264 is very, very, very tightly compacted. It is like vacuum packaging. To ask the computer to unpack, and then do its thing, and then re-pack in real time is asking a whole lot, especially with only two cores. Four cores is much better, and what Cineform NeoScene does is it un-vacuum-packs the files for you, so your cores can process them much easier. I have a quad core but I still like to use it. Also, if you ever do any kind of keying or effects, it makes it much, much easier on your computer.
Norman Willis
http://www.nazareneisrael.org