i have the same problem with chrome on my laptop. Nothing wrong with your setup its just chrome when you have lots of tabs open its freezes. Could be a bug, they'll fix it eventually.
It happens when I have opened only 2-3 tabs.
What about the 2nd problem i.e.screen going black??I have installed latest updated amd catalyst display driver version 12.104.0.0.....or is it a problem in windows 8....Is anybody else having this problem of getting the black screen after changing the display off time in the power settings of windows 8??