Mac os and ga-870a-ud3 ????

Short answer: No. I have the same board, and it will not allow me install OS X at all. I have no idea why, but it won't.

what cpu you have

CPU is irrelevant... you simply can't install MacOS on any computer you want. MacOS will only install on Mac computers.

Not true. Several people have hacked OS-X to install on non-mac platforms. It's fairly common actually.



http://wiki.osx86project.org/wiki/index.php/Main_Page

http://www.osx86project.org/

Yes... "hacked" being the operative word. You are not legally allowed to install MacOS on any other computer than a Mac. I didn't mention hacks for a reason. Besides, if the OP wants to game, then MacOS is pretty useless in that department. Sure, it's better now than it ever has been... but finding drivers for the myriad of hardware in a custom-built machine is a nightmare. If you can find any at all, that is...

Reason #984812312 to not but Apple products.