haha, it comes down to just one thing - Frequency is NOT the decide all factor- Core 2 duo processors (what macs use now) are faster than most P4's (in most applications) because they A) have more L2 cache B) are dual core* C) are more efficient D) are 64 bit* (Items denoted by asterisks are only applicable in particular circumstances.) take AMD and Intel for example, the naming scheme AMD uses (3800+, 4000+ etc...) could be used as a rough* comparison to intel P4 chips (as most intel chips are known by their core frequency) An AMD 2800+ runs at 2.06 ghz (if i remember right) yet, was roughly on par with a 2.8 ghz P4, because Frequency isn't everything. i would have to say that a 1.86 ghz core 2 duo (slowest processor on new intel macs) will be faster than a 2.8 ghz p4 in almost everything (i never owned a P4 so i cannot personally vouch for its performance, however i have an AMD 2800+ ,2.13 ghz P-M, and a 2.0 core 2 duo, and the difference between the three are huge.) Add the efficiency of mac os x over windows, and i assure you, you will not be disappointed.