In regards to your computer, the intel chip is a lot of the price of it, so no it can’t be put into an older mac cos all the parts are incompatible. If you’re serious about editing, you should upgrade to a quad core anyway if you can, even the new quad core MacBook pro range or even an i5 or i7 iMac, although judging by what I’m reading the i5 would be more suitable for you because the i7 would probably be a waste of most for you 🙂
😀
Tom Morter-Laing
Certified Apple Product Proffessional, 2010
Production Assistant, Grace Productions
Degree; TV Production