General Desktop CPU hierarchy
2nd generation Intel® Core™ processors (includes Intel Core i7, i5, i3, Pentium®, and Celeron®)
1st generation Intel Core processors (includes Intel Core i7, i5, i3, Pentium®, and Celeron®)
Intel Core processors (including the Intel Core 2 Quad, Core 2 Duo, Pentium, and Celeron processors)
Intel Processors with the NetBurst® architecture (Intel Pentium D, Intel Pentium 4, Intel Celeron)
There is a little overlap with the high end outperforming the low end of the processor family above it. Now if you are looking for more specific information on one processor vs. another you will have to look at some of the benchmarks that our out there.
Christian Wood
Intel Enthusiast Team