Which one is faster ? Well it depends on what application you are running. If the application can take advantage of multi-core (such as rendering application), then the Core 2 Quad is faster. Unfortunately, multi-thread programming is a real challenge, so most of application right now can only use upto 2 cores. So go for an i7, it will perform better than the Quad 2Ghz in most application because the advantage of higher frequency and newer technology, and even in rendering it probably does not fall very behind.