There are many people who think that Apple’s OS X is the best operating system out there, but it only runs on Apple hardware. That’s a problem, if you’re on a budget – Macs are nice, but expensive. So quite a few people have been tinkering with OS X to get it to run on a standard PC, with variable results.
ZD Net has an article that gives a good overview of what you might have to do if you want to attempt this. Keep in mind that you’ll be violating Apple’s license agreement if you try. But if you’re lucky, and have just the right hardware, you might get it to work.
For the Intel platform, the closer the components are to those in a real Mac, the greater the chances of success. Specifically, this means a motherboard with an Intel CPU/chipset combination that supports SSE3. However, there can still be problems. In our tests, for example, we couldn’t convince the Esprimo P5925 with Intel’s Q35 chipset to cooperate with Mac OS. Perhaps the Q35’s integrated vPro technology for remote client management is the culprit. However, we were successful with motherboards using Intel’s 975, 965 and X38 chipsets.
Personally, I think it’s more trouble than it’s worth. It’s easier just to get a used Mac. Still, I have to admit that if Apple came out with a PC version of OS X, I’d jump on it.