Again, I really wouldn't recommend it. I'm reading up on it now and it seems that system updates have to be done manually and you have to manually configure the system based on your installed hardware.
Seriously, you're setting yourself up for a world of pain. Only try chromeOS if you're coming in for the purpose of tinkering and learning.
As for your CPU, there's nothing specific about ChromeOS which makes it 'fit' your CPU better than anything else. Xubuntu will run great and will be much easier to get up and running, because it's designed to be run on normal PCs.