Hi there,
Works absolutely fine. Modern mac hardware is just standard intel chipsets and graphics etc. I am typing this from a 'mac' made from a PC motherboard, Intel core i5 processor, displaying on an apple 30" display. It has run flawlessly every day for the last 5 years.
If you are interested in building a PC from scratch and knowing that the components are 100 percent compatible, I suggest you google tonymacx86.
If you'd like to see if what you have will work, then see..
OSx86
Hope this helps.
high-flyer