Running FCP7 on the newest iMac

I'll continue to use FCP7.

How much of a speed increase am I going to see if I run it on the newest 27" iMac *(3.2 GHz quad-core Intel Core i5 processor) compared to my mid-2008 iMac (Intel Core 2 Duo Processor Speed: 2.8 GHz)?

Is rendering going to be noticeably faster?