Not sure but arent PS3's dual core with like a gig of ram? You would need a pretty damn nice old PC to compare to a PS3. I think the 360 has a tri core IBM processor too. But w/e sounds intresting.
ps3's actually have like 8 core processors... its pretty cool stuff, and there is the problem... the hardware on the PS3 is so complicated no companies have the time or knowhow to develop games to run on this hardware, the 8 cores are seperated and made to process different parts of the game, like 1 core dedicated to physics, 1 dedicated to AI, 1 dedicated to lighting, and so on and so fourth. the processors if i remember correctly were developed by IBM and supposed to revolutionize computing, but i dont see that happening right now...
EDIT: i found the link for the hardware info on the PS3, its actually really interesting to read about, i guess i was off by a core, its 7 if i understood that correctly, enjoy
http://en.wikipedia.org/wiki/PlayStation_3_hardware
but yea, overall i think developing a pc gaming operating system would be a great idea, you should get some patents or something and seriously pursue it, and bring it to microsoft's attention and get in on some profit