Originally Posted by Deadbeard
It's all in the stepping. Stepping C is a third rework of the chip after A (engineering samples) and B (first run tests iirc), then 7 is the 7th revision of that stepping.
TBH all this says is that the chip could've been released probably a couple months ago, but AMD wanted to work on it more/build more stock.
If you look at some other AMD/ATI cards, they launched at A0/A1 revision. Base metal layers usually do not see a respin unless something was TERRIBLY wrong.
Seeing as this is a whole new node and new transistor type, AND AMD had near exclusive access to the fab... I guess its not surprising it has seen so many revisions.
Id imagine "hot lots" turn around really quickly when you are the only one using a production line, or you could send three spins down the line at the same time and pick the best performing one.
Pure speculation here... but different spins can have radically different power/clock curves. Perhaps there is a specific variant for mobile?Edited by KarathKasun - 6/28/16 at 11:15am