If you are reading from an ODD don't expect much of an improvement. You're going to rip at the rate of the drive. If you take that data and rip to a Matroska or something, then you will see a huge benefit. I'm impressed with my i7-2600K and my Sandy Bridge based MacBook in that regard.
Hmmmm.... Now I'm just working with a 640GB HDD on laptop, that'll help, I'll have to sort out an enclosure, Vantec are hard to come by in UK, looks like an overnight session with a deskfan, to rip a BD.