Well everything is made by TSCM(Taiwan Semiconductor Manufacturing Company). All AMD and nVidia GPU's, plus a bunch of chips for smart phones(Apple ect...).
The whole industry will(better) be making the move to 20nm soon. Early 2014 hopefully! And I'll agree with Ridiculous! 28nm tech dates to late 2011. The 7970 is extremely long lived! But you may agree that tech(hardware) is "finally" mature(fast) enough that it has some longevity. It has taken decades and billions of dollars, to get where we are today.
Check out the little table on Wikipedia, dating back to 1971. 20nm isn't listed, as this table is inline with Intel and their CPU's. Ah, fond memories(not really) of my old Pentium 4 (1.7 GHz), even brand new that Windows XP based rig was slow.
http://en.wikipedia.org/wiki/Semiconductor_device_fabrication