Well, every review I read seems to indicates that 7970 GHz Edition is pretty much the same as 7970 except it's faster. However, you can also overclock the 7970 to be as fast as 7970 GHz Edition. If that's the case, then what's the point of buying 7970 GHz Edition for $70 more? How can you justify the $70 difference? Does GHz Edition comes with extra features that I don't know?